Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 456 · 40 questions

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

1. 1.22 × 15 =
2. 2.32 × 15 =
3. 3.30 × 12 =
4. 4.45 × 15 =
5. 5.32 × 24 =
6. 6.49 × 14 =
7. 7.31 × 15 =
8. 8.19 × 12 =
9. 9.23 × 15 =
10. 10.12 × 12 =
11. 11.42 × 18 =
12. 12.15 × 15 =
13. 13.38 × 24 =
14. 14.21 × 24 =
15. 15.18 × 18 =
16. 16.12 × 24 =
17. 17.12 × 18 =
18. 18.20 × 16 =
19. 19.43 × 15 =
20. 20.16 × 18 =
21. 21.43 × 18 =
22. 22.20 × 24 =
23. 23.49 × 24 =
24. 24.18 × 24 =
25. 25.46 × 12 =
26. 26.11 × 12 =
27. 27.40 × 24 =
28. 28.49 × 16 =
29. 29.18 × 12 =
30. 30.35 × 15 =
31. 31.20 × 15 =
32. 32.33 × 12 =
33. 33.25 × 14 =
34. 34.28 × 15 =
35. 35.16 × 15 =
36. 36.41 × 18 =
37. 37.38 × 12 =
38. 38.24 × 16 =
39. 39.13 × 12 =
40. 40.17 × 18 =

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