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The document provides examples of multiplying 3-digit numbers by 1-digit numbers. It shows the step-by-step work for multiplying 243 × 2, 130 × 3, 122 × 4, and 121 × 4. It then shows a more efficient method for multiplying 242 × 4 by breaking it into place value columns. Students are prompted to try multiplying 124 × 2 on their own whiteboards.
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- 1. multiply 3 digits by 1 digit
- 2. Starter T O Write a short multiplication to match the counters. T O X
- 3. 243 Hundreds Tens Ones 486 2 times 243 × 2 = 486
- 4. Hundreds Tens Ones 130 × 3 =390 I think the answer is 390
- 5. 122 × 4 = H T O 1 2 2 4 Hundreds Tens Ones (2 × 4) (20 × 4) (100 × 4) 488 X
- 6. 121 × 4 = H T O 1 2 1 4 Hundreds Tens Ones X Have a go….
- 7. Hundreds Tens Ones H T O 2 4 2 x 4 10 10 10 10 100 100 1 1 10 10 10 10 100 100 1 1 10 10 10 10 100 100 1 1 10 10 10 10 100 100 1 1 How could we make this method more efficient?
- 8. Hundreds Tens Ones H T O x 100 1 1 1 1 100 1 1 1 1 100 1 1 1 1 1 0 4 3 Another one…
- 9. H T O 1 2 4 x 2 Your turn – have a go at calculating this one your whiteboards… Hundreds Tens Ones