Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 796 · 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 × 14 =
2. 2.14 × 15 =
3. 3.42 × 12 =
4. 4.32 × 14 =
5. 5.40 × 14 =
6. 6.27 × 24 =
7. 7.20 × 14 =
8. 8.15 × 15 =
9. 9.16 × 16 =
10. 10.47 × 14 =
11. 11.30 × 16 =
12. 12.39 × 16 =
13. 13.11 × 14 =
14. 14.38 × 14 =
15. 15.28 × 15 =
16. 16.35 × 12 =
17. 17.45 × 12 =
18. 18.46 × 16 =
19. 19.43 × 15 =
20. 20.29 × 14 =
21. 21.22 × 16 =
22. 22.22 × 12 =
23. 23.45 × 15 =
24. 24.49 × 24 =
25. 25.43 × 16 =
26. 26.22 × 18 =
27. 27.13 × 12 =
28. 28.32 × 15 =
29. 29.16 × 12 =
30. 30.14 × 14 =
31. 31.45 × 24 =
32. 32.13 × 15 =
33. 33.39 × 12 =
34. 34.13 × 16 =
35. 35.29 × 15 =
36. 36.12 × 24 =
37. 37.14 × 18 =
38. 38.45 × 16 =
39. 39.28 × 14 =
40. 40.15 × 14 =

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