Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 469 · 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 × 16 =
2. 2.15 × 16 =
3. 3.20 × 18 =
4. 4.29 × 18 =
5. 5.38 × 12 =
6. 6.45 × 12 =
7. 7.41 × 18 =
8. 8.42 × 14 =
9. 9.18 × 24 =
10. 10.49 × 12 =
11. 11.21 × 14 =
12. 12.31 × 14 =
13. 13.44 × 16 =
14. 14.12 × 24 =
15. 15.25 × 24 =
16. 16.16 × 18 =
17. 17.28 × 24 =
18. 18.25 × 18 =
19. 19.17 × 12 =
20. 20.38 × 18 =
21. 21.30 × 12 =
22. 22.16 × 12 =
23. 23.43 × 24 =
24. 24.19 × 15 =
25. 25.47 × 14 =
26. 26.20 × 14 =
27. 27.47 × 12 =
28. 28.19 × 18 =
29. 29.23 × 15 =
30. 30.15 × 14 =
31. 31.13 × 16 =
32. 32.48 × 18 =
33. 33.22 × 14 =
34. 34.47 × 16 =
35. 35.15 × 18 =
36. 36.39 × 12 =
37. 37.33 × 12 =
38. 38.42 × 12 =
39. 39.16 × 14 =
40. 40.45 × 14 =

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