Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 520 · 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 × 14 =
2. 2.13 × 12 =
3. 3.32 × 14 =
4. 4.18 × 14 =
5. 5.43 × 14 =
6. 6.20 × 15 =
7. 7.40 × 18 =
8. 8.42 × 18 =
9. 9.21 × 16 =
10. 10.28 × 18 =
11. 11.40 × 24 =
12. 12.27 × 14 =
13. 13.41 × 16 =
14. 14.15 × 24 =
15. 15.35 × 12 =
16. 16.38 × 18 =
17. 17.31 × 14 =
18. 18.11 × 16 =
19. 19.12 × 15 =
20. 20.23 × 12 =
21. 21.41 × 18 =
22. 22.25 × 24 =
23. 23.20 × 18 =
24. 24.39 × 16 =
25. 25.18 × 24 =
26. 26.48 × 24 =
27. 27.42 × 16 =
28. 28.18 × 15 =
29. 29.12 × 14 =
30. 30.17 × 18 =
31. 31.22 × 15 =
32. 32.40 × 15 =
33. 33.25 × 18 =
34. 34.15 × 12 =
35. 35.11 × 24 =
36. 36.18 × 18 =
37. 37.47 × 14 =
38. 38.28 × 14 =
39. 39.46 × 16 =
40. 40.21 × 12 =

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