Reading & writing · Grades 3–5

The folded bridge

An original passage with comprehension questions and a teacher key.

The folded bridge

Sana and Theo tested paper bridges between two equal stacks of books. They first laid a flat sheet across the gap. It bent under three counters. Theo wanted thicker paper, but Sana suggested folding another sheet of the same paper into pleats. They kept the gap and the counters the same. The folded bridge held nine counters before bending. Their note said that the folded design held more counters in this test. They did not claim that every folded shape would always be stronger.

Try it yourself

How many counters were on the flat sheet when it bent?
What is the difference between the two reported counter counts?
What did the pupils deliberately change?
1. the paper's folded shape
2. the counter material
3. the book titles
4. the gap and paper type
Name two things they kept the same.
Why is their written conclusion more careful than folded paper is always stronger?

Which next step would best strengthen their comparison?
1. Use unrelated materials without recording them.
2. Repeat both designs under the same conditions.
3. Hide the flat result.
4. Change every factor at once.

Answers and marking notes

3
The flat sheet bent under three counters in the described test.
6
9 − 3 = 6.
the paper's folded shape
They used the same paper type with a different structure.
The gap, paper type and counters.
Credit any two stated controlled features.
It is limited to the tested design and conditions rather than every possible folded shape.
Credit scope and uncertainty.
Repeat both designs under the same conditions.
Repeats can reveal variation in the comparison.

Preview material · independent educational review required. Grade bands are approximate, not official curriculum alignment.