Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 99 · 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. 1.46 × 16 =
2. 2.32 × 16 =
3. 3.40 × 12 =
4. 4.43 × 18 =
5. 5.27 × 14 =
6. 6.17 × 12 =
7. 7.16 × 14 =
8. 8.49 × 14 =
9. 9.11 × 18 =
10. 10.17 × 18 =
11. 11.38 × 24 =
12. 12.24 × 14 =
13. 13.35 × 18 =
14. 14.40 × 18 =
15. 15.38 × 14 =
16. 16.21 × 12 =
17. 17.32 × 12 =
18. 18.18 × 12 =
19. 19.18 × 14 =
20. 20.44 × 12 =
21. 21.12 × 16 =
22. 22.15 × 14 =
23. 23.12 × 14 =
24. 24.17 × 15 =
25. 25.22 × 15 =
26. 26.31 × 24 =
27. 27.27 × 16 =
28. 28.20 × 15 =
29. 29.14 × 14 =
30. 30.43 × 14 =
31. 31.39 × 18 =
32. 32.43 × 12 =
33. 33.22 × 16 =
34. 34.14 × 16 =
35. 35.47 × 12 =
36. 36.23 × 14 =
37. 37.24 × 16 =
38. 38.39 × 14 =
39. 39.18 × 16 =
40. 40.17 × 16 =

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