Reading & writing · Grades 4–6
Two model bridges · reading guide
An original passage with comprehension, reasoning and a marking guide.
Two model bridges
Ravi made two paper bridges of the same length using the same paper. One was flat; the other was folded into an accordion shape. He added equal coins one at a time. The folded bridge held more coins. Ravi repeated the comparison before writing down his conclusion.
Read, think and respond
- What feature of the bridges did Ravi deliberately change?
- Name two things Ravi kept the same.
- Why was repeating the comparison useful?
Suggested answers and marking notes
What feature of the bridges did Ravi deliberately change?
the shape
Name two things Ravi kept the same.
Rubric: Identify the length and paper, and/or the use of equal coins. Award credit for two supported controls.
Why was repeating the comparison useful?
Rubric: Explain that repetitions help reveal consistency or variation and reduce reliance on one unusual trial. Do not say repetition guarantees a correct conclusion.
Learning preview · teacher review required. Grade bands are approximate, not official curriculum alignment.