Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 465 · 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. 1.29 × 12 =
2. 2.15 × 12 =
3. 3.28 × 12 =
4. 4.18 × 14 =
5. 5.15 × 15 =
6. 6.18 × 15 =
7. 7.46 × 14 =
8. 8.38 × 14 =
9. 9.42 × 14 =
10. 10.40 × 14 =
11. 11.39 × 12 =
12. 12.25 × 24 =
13. 13.16 × 24 =
14. 14.40 × 12 =
15. 15.16 × 14 =
16. 16.49 × 18 =
17. 17.19 × 12 =
18. 18.17 × 16 =
19. 19.32 × 18 =
20. 20.25 × 16 =
21. 21.24 × 12 =
22. 22.32 × 15 =
23. 23.12 × 15 =
24. 24.30 × 15 =
25. 25.22 × 24 =
26. 26.27 × 12 =
27. 27.45 × 16 =
28. 28.42 × 24 =
29. 29.28 × 14 =
30. 30.40 × 15 =
31. 31.35 × 15 =
32. 32.14 × 18 =
33. 33.20 × 16 =
34. 34.13 × 12 =
35. 35.34 × 12 =
36. 36.46 × 15 =
37. 37.13 × 18 =
38. 38.30 × 18 =
39. 39.33 × 15 =
40. 40.31 × 24 =

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