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P3 Two-digit by One-digit: Paper 1 Basics
P3 Two-digit by One-digit: Paper 1 Basics
This paper starts from splitting: read a two-digit number as tens plus ones, multiply each part and add, then move to the written form with carrying and to simple per-box word problems.
Direct answers Answers: 1 69; 2 28; 3 96; 4 84; 5 86; 6 72 pens; 7 60; 8 68; 9 90; 10 the correct answer is 69.
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 23 times 3.
- FoundationWork out 14 times 2.
- FoundationWork out 32 times 3.
- IntermediateWork out 21 times 4.
- IntermediateWork out 43 times 2.
- IntermediateEach box holds 24 pens. How many pens are there in 3 boxes?
- ChallengeWork out 12 times 5 and explain why the answer is a multiple of ten.
- ChallengeWork out 34 times 2 and check it by addition.
- ChallengeWork out 45 times 2 and say whether the tens digit changed.
- Error redoError clinic: a pupil wrote 23 times 3 equals 29. What went wrong, and what is the correct answer?
03 Answers and one-line notes
| # | Answer | One-line note |
|---|---|---|
| 1 | 69. 20 times 3 is 60 and 3 times 3 is 9, so 60 plus 9 is 69. | Split the two-digit number into tens and ones, multiply each, then add. |
| 2 | 28. 10 times 2 is 20 and 4 times 2 is 8, so the total is 28. | Multiply the ones first, then add the tens part. |
| 3 | 96. 30 times 3 is 90 and 2 times 3 is 6, which gives 96. | For a multiple of ten, multiply the tens digit and then put the zero back. |
| 4 | 84. 20 times 4 is 80 and 1 times 4 is 4, so the answer is 84. | Multiplying by 4 is the same as doubling twice. |
| 5 | 86. 40 times 2 is 80 and 3 times 2 is 6, giving 86. | In the written form, line up the place values before multiplying. |
| 6 | 72 pens, because 24 times 3 is 72. | So many per box in so many boxes means multiply, not add. |
| 7 | 60. 10 times 5 is 50 and 2 times 5 is 10, so the total is 60; the ones digit gives a full ten. | Multiplying by 5 always leaves a ones digit of 0 or 5. |
| 8 | 68. 30 times 2 is 60 and 4 times 2 is 8, which makes 68; 34 plus 34 also gives 68. | Multiplying by 2 is the same as adding the number to itself, which is an easy check. |
| 9 | 90. 40 times 2 is 80 and 5 times 2 is 10, so the total is 90; the tens digit rises from 4 to 9 because one ten is carried. | When the ones product reaches ten, carry one into the tens place. |
| 10 | The 9 from 3 times 3 was written as the whole answer instead of being added to 60. The correct answer is 69. | After splitting the number, both parts must be added back. |
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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