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Short Story · Follow a chain of causes and effects in a story: find what made each event happen, connect events with because and so, and explain which cause led to the solution

Short Story: Forty Cans and a Plank

An original story about a class food drive, a split box and a stage with three steps. Trace each cause and effect, then explain how the problem got solved.

Children use a gentle ramp and a red wagon to deliver food-drive boxes to a school stage.
Illustration of the original fictional story about teamwork and cause and effect; AI-generated illustration. Generation provenance
What you’ll practiseIdentify the main problem in the story, trace how each event causes the next one, use because and so to connect causes and effects, and explain which event led to the solution.

Device/browser voice. Pronunciation and availability vary.

A wall of cans

This is an original short story. The characters, Birchview Public School and the food drive are invented.

By Thursday afternoon, the back corner of Room 9 looked like a grocery store. For two weeks, Ms. Adeyemi's Grade 4 class had been collecting food for the neighbourhood food bank, and the cans had piled up faster than anyone expected. Soup, beans, tomatoes, corn. Mateo had counted them twice: three hundred and twelve.

"Tomorrow is the assembly," Ms. Adeyemi reminded everyone. "We need all the boxes up on the gym stage by 9 o'clock, so the whole school can see what we collected. The food bank van comes right after."

Mateo looked at the stage in his mind. It was only about as high as his waist, but it had three narrow steps at the side. Then he looked at the boxes. "That's a lot of trips," he said.[1]

The first plan

Hana had an idea. "Let's save time. We'll put more cans in each box, so we'll only have to make a few trips."

Everybody liked the idea of fewer trips. They packed the cans in tight. Mateo squeezed forty cans into the biggest box and taped the flaps shut with a grin.

Friday morning, Mateo and Hana lifted the forty-can box together. It was so heavy that their arms shook before they even reached the gym doors. At the bottom of the stage steps, Hana's fingers slipped. The box dropped onto the first step, and its bottom split open.

Cans rolled everywhere. A can of corn bounced off the step and spun under the piano. Two soup cans raced each other across the gym floor. The Grade 1 class, lining up for the assembly, cheered.[1]

The second plan

While the class chased cans, Jordan pointed at the red wagon by the gym door. "We can put the boxes in the wagon," he said. "Then nobody has to carry anything."

The wagon worked perfectly across the floor. Then it reached the steps and stopped. Its wheels bumped against the first step and would not climb. Three kids tried to lift the whole wagon, boxes and all, up the steps, but it was even heavier than the forty-can box.

"We have twenty minutes," Ms. Adeyemi said, checking the clock. Her voice was calm, but Mateo saw her glance at the door where the principal would soon walk in.[1]

A long board and a short one

Mateo stared at the steps. Something from science class tugged at his memory: the ramp beside the front stairs of the school was much longer than the stairs, and his class had learned that a longer slope needs a smaller push.

"We don't need to lift the wagon," he said. "We need a ramp."

Mr. Ferreira, the custodian, was setting up chairs. When he heard the plan, he went to the storage room and came back with two boards. "Short one or long one?" he asked.

They tried the short board first, because it was lighter to carry. Mr. Ferreira set it from the floor to the edge of the stage, and it tilted up sharply. When Jordan pushed the wagon, it rolled halfway up and then rolled right back down. The slope was too steep.

Mr. Ferreira set the long board in its place, checking that both ends were steady. This time the slope was gentle. Jordan and Hana pushed together, and the wagon rolled slowly up, up and onto the stage. It was a longer trip, but the push was easy.[1]

Lighter boxes, steady wheels

There was one more change. Hana repacked the cans from the split box into three smaller boxes. "Less in each box, so no more splitting," she said. Mateo nodded. This time he did not argue for fewer trips.

By 8:55, every box was lined up on the stage, and the corn can from under the piano was back where it belonged. When the principal announced the total, the whole gym clapped for three hundred and twelve cans.

Afterward, Ms. Adeyemi asked the class to think about the morning. "What made it go wrong, and what made it go right?"

Mateo thought about the forty cans, the stuck wagon and the long board. "Every time we changed one thing," he said, "it changed the next thing."[1]

Fast lesson

Use these checks before you answer the practice questions.

Use arrows, not just lists

A list of events shows order. A chain with arrows shows that one event made the next happen. Ask your child, "Did this happen just after, or because of?"

One cause, more than one effect

The split box led to rolling cans and to a new plan. Point out that causes can branch.

Connect to the ramp lesson

The story uses the same idea as the Daily Read on ramps: a longer, gentler slope needs a smaller push. Ask your child to find the sentence that shows this.

Fiction can teach real ideas

The school and the people are invented, but the science of ramps in the story is real. Ask which parts are invented and which ideas are true in real life.

Common mistakes

Treating every event that comes next as an effect.

Why this fails: Some events only follow in time. An effect must happen because of the cause.

Giving only one cause for the spill.

Why this fails: The heavy load and the slipping fingers worked together.

Saying the wagon solved the problem.

Why this fails: The wagon alone got stuck; the gentle ramp is what let it reach the stage.

Word Lab

Use the meaning, hear the word, then try it in your own sentence.

food bank

noun phrase

a place that collects food and gives it to people who need it

The class collected cans for the food bank.

food drive

noun phrase

a time when people collect food to give away

Our school food drive lasted two weeks.

assembly

noun

a meeting of the whole school, often in the gym

The principal announced the total at the assembly.

custodian

noun

a person who takes care of a school building

The custodian brought two boards from the storage room.

split

verb

to break open or come apart

The bottom of the heavy box split open.

plank

noun

a long, flat piece of wood

They used a long plank as a ramp.

slope

noun

a surface that goes up or down at an angle

The long board made a gentle slope.

steep

adjective

rising sharply

The short board was too steep, so the wagon rolled back.

steady

adjective

firm and not moving or shaking

Mr. Ferreira made sure both ends of the board were steady.

cause

noun

something that makes another thing happen

The heavy box was the cause of the spill.

effect

noun

what happens because of a cause

The effect was cans rolling across the gym.

repack

verb

to put things into a container again, often in a new way

Hana repacked the cans into three smaller boxes.

Check your understanding

Choose an answer, explain your choice, and then check. Hints and retries are welcome.

Problem1. What is the main problem the class must solve?
Show answer and explanation

Answer: They must get all the heavy boxes onto the stage by 9 o'clock.. The class has to get the boxes up the stage steps before the assembly. They collected plenty of cans, the assembly is not cancelled, and the van comes after the assembly, so it is not late.

Cause and effect2. Why did the bottom of the big box split open?
Show answer and explanation

Answer: Because it was packed with forty cans and dropped on a step. The box was very heavy, Hana's fingers slipped and it dropped onto the step. The wagon and the boards come later in the story, and the story never says the tape was wet.

Cause and effect3. What caused the class to pack so many cans into each box?
Show answer and explanation

Answer: They wanted to make fewer trips and save time.. Hana wanted to save time with fewer trips. The story does not say they ran out of boxes, Ms. Adeyemi never gave that instruction, and the food bank made no request.

Try the questions here. Public practice does not save a learning record.

Support · Find it in the text

Support · Find it in the text practice

Each answer is stated in the story. Point to the sentence.

Locate

1. How many cans did the class collect?

Locate

2. By what time did the boxes need to be on the stage?

Locate

3. How many cans did Mateo squeeze into the biggest box?

Locate

4. Who suggested using the wagon?

Locate

5. Where did Mr. Ferreira get the boards?

Locate

6. How many smaller boxes did Hana use for the cans from the split box?

Apply · Link causes and effects

Apply · Link causes and effects practice

Use because or so to join each cause to its effect.

Because

7. Finish the sentence: The box split open because …

So

8. Finish the sentence: The wagon could not climb the steps, so …

Because

9. Why did the wagon roll back down the short board?

So

10. Finish the sentence: The long board made a gentle slope, so …

Chain

11. Put these in cause-and-effect order: wagon stuck at steps · class wanted fewer trips · box split · boxes packed with many cans.

Own words

12. In one sentence, explain how Mateo's science memory changed the story.

Reason · Causes that matter

Reason · Causes that matter practice

Decide which causes matter most and test your ideas.

Sort

13. Is "A can of corn spun under the piano" an important cause in the chain, or a detail?

  1. An important cause
  2. A detail
Sort

14. Is "Hana's fingers slipped" an important cause, or a detail?

  1. An important cause
  2. A detail
Test it

15. If the class had packed smaller boxes from the start, which event might not have happened?

Compare

16. How were the first two plans alike, and why did both fail?

Theme

17. What lesson could a reader take from the story?

Practice answer key

  1. 1. Three hundred and twelve.
    See 'A wall of cans'.
  2. 2. 9 o'clock.
    See 'A wall of cans'.
  3. 3. Forty.
    See 'The first plan'.
  4. 4. Jordan.
    See 'The second plan'.
  5. 5. From the storage room.
    See 'A long board and a short one'.
  6. 6. Three.
    See 'Lighter boxes, steady wheels'.
  7. 7. … it was packed with forty cans and dropped onto a step.
    Two causes worked together: the heavy load and the drop.
  8. 8. … the class needed another way to get it onto the stage.
    The stuck wagon caused the search for a new plan.
  9. 9. Because the short board made a slope that was too steep.
    A steep slope needs a bigger push.
  10. 10. … the wagon rolled up with an easy push.
    The gentle slope caused the success.
  11. 11. Class wanted fewer trips → boxes packed with many cans → box split → (new plan) wagon stuck at steps.
    Each event leads to the next.
  12. 12. Because Mateo remembered that a longer slope needs a smaller push, the class used a ramp instead of lifting the wagon.
    The memory caused the turning point.
  13. 13. A detail
    It is a fun effect of the spill, but it does not cause anything that changes the plan.
  14. 14. An important cause
    It made the heavy box drop and split.
  15. 15. The box splitting open on the step.
    Changing a cause can remove its effect.
  16. 16. Both tried to avoid extra work, but both still needed someone to lift a heavy load up the steps.
    The ramp was the first plan that avoided lifting.
  17. 17. When a plan fails, look at what caused the problem and change that one thing.
    Answers vary; the theme should match events in the story.

Related skills

Put it in your own words

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Check your own explanation

This is self-review, not automatic marking.

Compare with a model response

The class wanted to make fewer trips, so they packed forty cans into one big box. The box was very heavy, so when Hana's fingers slipped, it dropped and split open. Next, Jordan put the boxes in a wagon, but the wagon got stuck because its wheels could not climb the steps. Mateo remembered that a long slope needs a smaller push, so Mr. Ferreira brought two boards. The short board was too steep, so the wagon rolled back down. The long board made a gentle slope, so the wagon rolled up easily. I think the long board mattered most, because it let the class move the boxes without lifting them.

Sources and revision notes

Source check: 2026-11-04. Grade guidance is an editorial suggestion, not a standardised reading score.

  1. Reading Rockets — Story Maps (reading-strategy background only)
What changed in this edition?

Original fiction. All characters, Birchview Public School, the food drive and the events are invented, and the story is not about any real school, food bank or person. The source supports the reading strategy, not the story: Reading Rockets' Story Maps page describes a story map as a graphic organizer that helps students learn the elements of a narrative, including characters, plot, setting, problem and solution, and says story maps improve comprehension of narrative text. The cause-and-effect chain with because and so arrows, the "just after or because of" test and the activities are this lesson's teaching framing. The ramp idea in the story matches the Daily Read lesson on inclined planes. Initial short story created 2026-11-04.