Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 18 · 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. 1.31 × 14 =
2. 2.14 × 16 =
3. 3.18 × 14 =
4. 4.47 × 14 =
5. 5.31 × 24 =
6. 6.12 × 15 =
7. 7.15 × 24 =
8. 8.13 × 24 =
9. 9.39 × 14 =
10. 10.42 × 18 =
11. 11.22 × 24 =
12. 12.37 × 15 =
13. 13.31 × 18 =
14. 14.46 × 16 =
15. 15.39 × 16 =
16. 16.11 × 16 =
17. 17.44 × 18 =
18. 18.33 × 16 =
19. 19.43 × 18 =
20. 20.18 × 15 =
21. 21.23 × 12 =
22. 22.24 × 16 =
23. 23.28 × 14 =
24. 24.24 × 12 =
25. 25.27 × 16 =
26. 26.27 × 15 =
27. 27.14 × 24 =
28. 28.41 × 16 =
29. 29.46 × 12 =
30. 30.49 × 12 =
31. 31.31 × 12 =
32. 32.40 × 18 =
33. 33.38 × 15 =
34. 34.43 × 16 =
35. 35.46 × 15 =
36. 36.15 × 12 =
37. 37.40 × 15 =
38. 38.16 × 24 =
39. 39.39 × 15 =
40. 40.13 × 14 =

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