Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 16 · 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. 1.13 × 14 =
2. 2.16 × 15 =
3. 3.24 × 12 =
4. 4.19 × 14 =
5. 5.36 × 15 =
6. 6.38 × 18 =
7. 7.38 × 15 =
8. 8.17 × 14 =
9. 9.14 × 15 =
10. 10.45 × 18 =
11. 11.14 × 24 =
12. 12.40 × 16 =
13. 13.32 × 24 =
14. 14.17 × 12 =
15. 15.13 × 24 =
16. 16.26 × 14 =
17. 17.42 × 16 =
18. 18.20 × 16 =
19. 19.37 × 12 =
20. 20.30 × 14 =
21. 21.28 × 15 =
22. 22.36 × 12 =
23. 23.31 × 18 =
24. 24.22 × 24 =
25. 25.12 × 24 =
26. 26.28 × 18 =
27. 27.33 × 14 =
28. 28.20 × 15 =
29. 29.37 × 16 =
30. 30.48 × 12 =
31. 31.15 × 16 =
32. 32.25 × 24 =
33. 33.22 × 15 =
34. 34.18 × 14 =
35. 35.15 × 18 =
36. 36.47 × 24 =
37. 37.11 × 14 =
38. 38.35 × 24 =
39. 39.39 × 12 =
40. 40.11 × 16 =

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