Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 114 · 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. 1.38 × 15 =
2. 2.30 × 12 =
3. 3.14 × 14 =
4. 4.21 × 12 =
5. 5.11 × 12 =
6. 6.39 × 14 =
7. 7.20 × 18 =
8. 8.17 × 18 =
9. 9.48 × 14 =
10. 10.40 × 14 =
11. 11.15 × 14 =
12. 12.13 × 24 =
13. 13.29 × 14 =
14. 14.15 × 24 =
15. 15.27 × 18 =
16. 16.40 × 24 =
17. 17.42 × 14 =
18. 18.16 × 12 =
19. 19.12 × 14 =
20. 20.14 × 16 =
21. 21.16 × 18 =
22. 22.49 × 14 =
23. 23.44 × 12 =
24. 24.11 × 16 =
25. 25.13 × 18 =
26. 26.11 × 14 =
27. 27.45 × 14 =
28. 28.22 × 12 =
29. 29.18 × 16 =
30. 30.25 × 12 =
31. 31.16 × 16 =
32. 32.42 × 12 =
33. 33.31 × 15 =
34. 34.34 × 16 =
35. 35.29 × 12 =
36. 36.14 × 24 =
37. 37.42 × 15 =
38. 38.31 × 12 =
39. 39.43 × 16 =
40. 40.24 × 24 =

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