Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 36 · 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. 1.47 × 18 =
2. 2.22 × 14 =
3. 3.21 × 14 =
4. 4.20 × 18 =
5. 5.16 × 14 =
6. 6.31 × 14 =
7. 7.25 × 16 =
8. 8.17 × 15 =
9. 9.45 × 18 =
10. 10.26 × 16 =
11. 11.31 × 24 =
12. 12.20 × 15 =
13. 13.41 × 12 =
14. 14.35 × 14 =
15. 15.42 × 16 =
16. 16.47 × 12 =
17. 17.36 × 16 =
18. 18.12 × 15 =
19. 19.27 × 18 =
20. 20.18 × 18 =
21. 21.24 × 15 =
22. 22.42 × 18 =
23. 23.28 × 12 =
24. 24.13 × 14 =
25. 25.35 × 16 =
26. 26.47 × 15 =
27. 27.19 × 12 =
28. 28.15 × 18 =
29. 29.43 × 12 =
30. 30.20 × 24 =
31. 31.27 × 24 =
32. 32.19 × 24 =
33. 33.23 × 15 =
34. 34.39 × 12 =
35. 35.45 × 16 =
36. 36.11 × 18 =
37. 37.41 × 16 =
38. 38.39 × 24 =
39. 39.17 × 18 =
40. 40.22 × 24 =

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