Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 717 · 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 × 15 =
2. 2.29 × 18 =
3. 3.20 × 14 =
4. 4.39 × 18 =
5. 5.13 × 18 =
6. 6.19 × 14 =
7. 7.44 × 18 =
8. 8.40 × 16 =
9. 9.35 × 16 =
10. 10.16 × 14 =
11. 11.18 × 14 =
12. 12.41 × 12 =
13. 13.47 × 24 =
14. 14.11 × 12 =
15. 15.19 × 24 =
16. 16.11 × 18 =
17. 17.12 × 24 =
18. 18.17 × 12 =
19. 19.20 × 15 =
20. 20.33 × 12 =
21. 21.42 × 24 =
22. 22.44 × 14 =
23. 23.19 × 18 =
24. 24.38 × 16 =
25. 25.11 × 15 =
26. 26.23 × 14 =
27. 27.38 × 12 =
28. 28.23 × 24 =
29. 29.39 × 12 =
30. 30.45 × 16 =
31. 31.32 × 12 =
32. 32.37 × 12 =
33. 33.15 × 15 =
34. 34.48 × 12 =
35. 35.13 × 15 =
36. 36.49 × 18 =
37. 37.25 × 14 =
38. 38.11 × 16 =
39. 39.47 × 12 =
40. 40.27 × 18 =

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