Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 785 · 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. 1.17 × 15 =
2. 2.27 × 18 =
3. 3.49 × 16 =
4. 4.12 × 15 =
5. 5.30 × 14 =
6. 6.25 × 24 =
7. 7.41 × 24 =
8. 8.28 × 12 =
9. 9.18 × 12 =
10. 10.29 × 15 =
11. 11.31 × 16 =
12. 12.15 × 14 =
13. 13.22 × 24 =
14. 14.41 × 15 =
15. 15.32 × 12 =
16. 16.16 × 15 =
17. 17.15 × 12 =
18. 18.31 × 15 =
19. 19.47 × 16 =
20. 20.42 × 15 =
21. 21.32 × 24 =
22. 22.24 × 12 =
23. 23.31 × 18 =
24. 24.17 × 12 =
25. 25.15 × 16 =
26. 26.47 × 12 =
27. 27.11 × 14 =
28. 28.43 × 18 =
29. 29.42 × 18 =
30. 30.29 × 12 =
31. 31.18 × 18 =
32. 32.14 × 15 =
33. 33.25 × 16 =
34. 34.16 × 16 =
35. 35.43 × 14 =
36. 36.35 × 24 =
37. 37.21 × 16 =
38. 38.39 × 16 =
39. 39.13 × 15 =
40. 40.19 × 24 =

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