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P1 Comparing Lengths Directly Paper 4 (error clinic)
P1 Comparing Lengths Directly Paper 4 (error clinic)
Ten error-clinic items on one-unit measuring, finding differences and joined lengths.
Direct answers Q1 red pencil by 3 clips, Q2 same length, Q3 longest 9 and shortest 5 spans with a gap of 4, Q4 4 palms, Q5 A, C, B, Q6 3 erasers, Q7 8 steps, Q8 joined 9 squares with a gap of 2, Q9 11 clips, Q10 not comparable.
01 Paper details (check answers afterwards)
| Item | Detail |
|---|---|
| Questions | 10 |
| Suggested time | 20 |
| Difficulty mix | Foundation 3 · Intermediate 3 · Challenge 3 · Error redo 1 |
| Chapter | Chapter: P1 Comparing Lengths Directly |
| Level | P1 |
02 Questions (10 items)
- FoundationTwo pencils are measured with the same paper clips: the red one is 7 clips long, the blue one is 4 clips. Which is longer, and by how many clips?
- FoundationTwo strips are measured with the same ruler; strip A is 8 squares long and strip B is also 8 squares. Which strip is longer?
- FoundationThree ropes measure 5 spans, 9 spans and 7 spans with the same hand. What are the longest, the shortest, and the difference?
- IntermediateMeasured with the same hand, a desk is 6 palms long and a storybook is 2 palms. How many palms longer is the desk?
- IntermediateWith one ruler three crayons measure A 9 squares, B 6 squares and C 7 squares. Arrange them from longest to shortest.
- IntermediateTwo hoses are measured with the same eraser: 10 erasers and 13 erasers. How many erasers longer is the second hose?
- ChallengeA corridor is 12 steps long, which is 4 steps longer than a classroom. How many steps is the classroom?
- ChallengeA 4-square strip and a 5-square strip are joined, then compared with a 7-square strip. Which is longer, by how many squares?
- ChallengeTwo pencils joined measure 15 clips in all, and one of them measures 6 clips. If a length of 4 clips is cut off, how many clips are left?
- Error redoA measures a desk as 5 palms and B measures the same desk as 6 erasers. A says the desk must be longer on B side. Is A right?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | The red pencil, by 3 clips | With the same clip, a bigger count means a longer object: 7 – 4 = 3. |
| 2 | They are the same length | The same number of squares means the same length. |
| 3 | Longest 9 spans, shortest 5 spans, difference 4 spans | Compare the three counts: 9 is the largest, 5 the smallest, and the gap is 4. |
| 4 | 4 palms | Subtract the two counts: 6 – 2 = 4 palms. |
| 5 | A, C, B | Compare the counts: 9 is the largest, then 7, then 6. |
| 6 | 3 erasers | 13 – 10 = 3, so the second hose is 3 erasers longer. |
| 7 | 8 steps | The classroom is shorter, so 12 – 4 = 8 steps. |
| 8 | The joined strips, by 2 squares | The joined length is 4 + 5 = 9 squares, and 9 – 7 = 2. |
| 9 | 11 clips | Start from 15 clips and take away 4 clips, leaving 11. |
| 10 | No, different sized units were used, so the counts cannot be compared | The slip is changing the measuring object; one same unit is needed. |
04 What to do after marking
- After marking, redo only the wrong items and write down which step went wrong (formula, unit, or misread number).
- Repeat the same item two days later; move to the next paper only when both attempts are correct.
- Parents only need the answer and note columns; there is no need to explain every item.
Check every answer, then rewrite the comparison sentence of any wrong item.Tutor Registration →
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