Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 816 · 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. 1.37 × 16 =
2. 2.41 × 12 =
3. 3.24 × 16 =
4. 4.11 × 24 =
5. 5.40 × 18 =
6. 6.43 × 18 =
7. 7.14 × 15 =
8. 8.22 × 18 =
9. 9.35 × 18 =
10. 10.20 × 16 =
11. 11.24 × 12 =
12. 12.47 × 12 =
13. 13.30 × 14 =
14. 14.13 × 15 =
15. 15.32 × 16 =
16. 16.12 × 14 =
17. 17.36 × 15 =
18. 18.25 × 15 =
19. 19.14 × 12 =
20. 20.37 × 18 =
21. 21.42 × 18 =
22. 22.43 × 15 =
23. 23.16 × 16 =
24. 24.40 × 15 =
25. 25.11 × 15 =
26. 26.27 × 18 =
27. 27.49 × 18 =
28. 28.16 × 12 =
29. 29.32 × 14 =
30. 30.28 × 24 =
31. 31.17 × 12 =
32. 32.24 × 18 =
33. 33.32 × 18 =
34. 34.38 × 18 =
35. 35.37 × 12 =
36. 36.17 × 14 =
37. 37.13 × 24 =
38. 38.46 × 12 =
39. 39.39 × 24 =
40. 40.22 × 16 =

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