Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 507 · 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. 1.17 × 24 =
2. 2.16 × 24 =
3. 3.28 × 18 =
4. 4.19 × 15 =
5. 5.42 × 24 =
6. 6.17 × 14 =
7. 7.15 × 12 =
8. 8.11 × 24 =
9. 9.40 × 18 =
10. 10.38 × 12 =
11. 11.32 × 15 =
12. 12.23 × 16 =
13. 13.46 × 14 =
14. 14.27 × 14 =
15. 15.33 × 24 =
16. 16.18 × 14 =
17. 17.24 × 18 =
18. 18.39 × 14 =
19. 19.24 × 14 =
20. 20.29 × 12 =
21. 21.23 × 14 =
22. 22.25 × 16 =
23. 23.41 × 12 =
24. 24.33 × 18 =
25. 25.47 × 12 =
26. 26.11 × 12 =
27. 27.16 × 16 =
28. 28.18 × 24 =
29. 29.14 × 14 =
30. 30.43 × 15 =
31. 31.35 × 14 =
32. 32.38 × 16 =
33. 33.23 × 15 =
34. 34.31 × 12 =
35. 35.29 × 14 =
36. 36.46 × 12 =
37. 37.32 × 18 =
38. 38.38 × 24 =
39. 39.21 × 24 =
40. 40.29 × 16 =

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