Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 94 · 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. 1.40 × 15 =
2. 2.39 × 14 =
3. 3.20 × 12 =
4. 4.23 × 18 =
5. 5.25 × 15 =
6. 6.29 × 18 =
7. 7.28 × 16 =
8. 8.33 × 12 =
9. 9.20 × 14 =
10. 10.18 × 15 =
11. 11.11 × 16 =
12. 12.12 × 15 =
13. 13.18 × 18 =
14. 14.11 × 12 =
15. 15.39 × 12 =
16. 16.19 × 12 =
17. 17.19 × 14 =
18. 18.35 × 24 =
19. 19.26 × 12 =
20. 20.11 × 15 =
21. 21.22 × 15 =
22. 22.45 × 16 =
23. 23.35 × 12 =
24. 24.13 × 18 =
25. 25.49 × 16 =
26. 26.22 × 16 =
27. 27.13 × 12 =
28. 28.38 × 24 =
29. 29.20 × 16 =
30. 30.43 × 16 =
31. 31.20 × 24 =
32. 32.16 × 16 =
33. 33.26 × 15 =
34. 34.22 × 14 =
35. 35.38 × 14 =
36. 36.16 × 15 =
37. 37.48 × 12 =
38. 38.47 × 14 =
39. 39.49 × 24 =
40. 40.18 × 24 =

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