Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 749 · 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. 1.39 × 15 =
2. 2.27 × 12 =
3. 3.27 × 15 =
4. 4.37 × 12 =
5. 5.18 × 15 =
6. 6.18 × 12 =
7. 7.25 × 24 =
8. 8.47 × 24 =
9. 9.12 × 24 =
10. 10.30 × 24 =
11. 11.27 × 18 =
12. 12.24 × 14 =
13. 13.42 × 12 =
14. 14.25 × 12 =
15. 15.33 × 18 =
16. 16.26 × 24 =
17. 17.12 × 18 =
18. 18.21 × 12 =
19. 19.11 × 18 =
20. 20.31 × 18 =
21. 21.45 × 18 =
22. 22.22 × 16 =
23. 23.37 × 24 =
24. 24.24 × 24 =
25. 25.43 × 14 =
26. 26.32 × 12 =
27. 27.47 × 12 =
28. 28.39 × 14 =
29. 29.14 × 18 =
30. 30.16 × 14 =
31. 31.21 × 14 =
32. 32.19 × 24 =
33. 33.41 × 16 =
34. 34.16 × 12 =
35. 35.15 × 16 =
36. 36.29 × 14 =
37. 37.47 × 14 =
38. 38.42 × 16 =
39. 39.31 × 14 =
40. 40.15 × 18 =

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