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P3 Two-digit by One-digit: Paper 4 Error Clinic
P3 Two-digit by One-digit: Paper 4 Error Clinic
This paper targets the commonest written-multiplication slips: dropped carries, partial products joined together and misaligned place values, reinforced with a times-nine shortcut, estimation, reverse factor work and word problems.
Direct answers Answers: 1 322; 2 348; 3 292; 4 603; 5 420; 6 315 chocolates; 7 62; 8 exact 406, difference 14; 9 768; 10 100.
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: P3 Two-digit by One-digit Multiplication |
| Level | P3 |
02 Questions (10 items)
- FoundationWork out 46 times 7 and state where the carry goes.
- FoundationWork out 58 times 6.
- FoundationWork out 73 times 4.
- IntermediateUse the times-ten-minus-one strategy to work out 67 times 9.
- IntermediateMay works out 84 times 5 as 20 and 40 and writes 4020. What is the correct answer?
- IntermediateEach box holds 45 chocolates. How many are there in 7 boxes?
- ChallengeA number times 6 is 372. What is the number?
- ChallengeEstimate 60 times 7 as 420, then find the exact value of 58 times 7 and the difference.
- ChallengeWork out 96 times 8 and show the carry.
- Error redoError clinic: Ming works out 25 times 4, gets 20 from 5 times 4 and writes 820. Give the correct answer and name the slip.
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 322. 6 times 7 is 42, so write 2 and carry 4; 4 times 7 is 28, plus 4 gives 32. | Whenever the ones product reaches ten, a carry must move to the tens column. |
| 2 | 348. 8 times 6 is 48, so write 8 and carry 4; 5 times 6 is 30, plus 4 gives 34. | The carried 4 must be added to the tens product, never dropped. |
| 3 | 292. 3 times 4 is 12, so write 2 and carry 1; 7 times 4 is 28, plus 1 gives 29. | A ones product of 12 means writing 2 and carrying 1. |
| 4 | 603. 67 times 10 is 670, and 670 minus 67 is 603. | Multiplying by 9 means multiplying by 10 and subtracting one copy. |
| 5 | 420. The 20 gives 0 with 2 carried, and 8 times 5 is 40, plus 2 makes 42. | Joining the two partial products is wrong; place values must line up. |
| 6 | 315 chocolates. 45 times 7 is 315. | Work out 5 times 7 first, carry 3, then add it to 4 times 7. |
| 7 | 62. 372 divided by 6 is 62, and 62 times 6 checks back to 372. | Undo a multiplication by dividing, then check with multiplication. |
| 8 | The exact answer is 406, a difference of 14. 58 times 7 is 406, and 420 minus 406 is 14. | Rounding 58 up to 60 makes the estimate larger than the exact answer. |
| 9 | 768. 6 times 8 is 48, so write 8 and carry 4; 9 times 8 is 72, plus 4 gives 76. | Dropping the carried 4 gives the wrong answer 728. |
| 10 | 100. 5 times 4 is 20, so write 0 and carry 2; 2 times 4 is 8, plus 2 makes 10, giving 100. | The carry belongs on the tens product; the 20 is not part of the answer. |
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.
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Questions and answers are written originally by the TutorZone team and are not taken from any school, publisher or examination authority paper. Every value is checked by computer.