Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 87 · 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. 1.29 × 15 =
2. 2.24 × 15 =
3. 3.12 × 18 =
4. 4.20 × 15 =
5. 5.41 × 15 =
6. 6.40 × 12 =
7. 7.14 × 16 =
8. 8.14 × 14 =
9. 9.34 × 16 =
10. 10.33 × 16 =
11. 11.43 × 14 =
12. 12.11 × 14 =
13. 13.34 × 14 =
14. 14.21 × 24 =
15. 15.31 × 12 =
16. 16.37 × 12 =
17. 17.47 × 12 =
18. 18.42 × 18 =
19. 19.18 × 24 =
20. 20.13 × 24 =
21. 21.49 × 18 =
22. 22.14 × 15 =
23. 23.30 × 14 =
24. 24.43 × 15 =
25. 25.29 × 12 =
26. 26.12 × 24 =
27. 27.21 × 18 =
28. 28.14 × 12 =
29. 29.18 × 16 =
30. 30.19 × 14 =
31. 31.41 × 16 =
32. 32.28 × 15 =
33. 33.49 × 24 =
34. 34.46 × 12 =
35. 35.21 × 14 =
36. 36.35 × 12 =
37. 37.13 × 18 =
38. 38.22 × 24 =
39. 39.45 × 14 =
40. 40.22 × 18 =

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