Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 323 · 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. 1.37 × 15 =
2. 2.17 × 18 =
3. 3.37 × 12 =
4. 4.36 × 12 =
5. 5.28 × 12 =
6. 6.19 × 16 =
7. 7.15 × 14 =
8. 8.33 × 16 =
9. 9.43 × 12 =
10. 10.38 × 24 =
11. 11.41 × 14 =
12. 12.14 × 12 =
13. 13.39 × 24 =
14. 14.22 × 15 =
15. 15.46 × 12 =
16. 16.29 × 15 =
17. 17.32 × 16 =
18. 18.16 × 24 =
19. 19.18 × 16 =
20. 20.31 × 12 =
21. 21.32 × 12 =
22. 22.46 × 15 =
23. 23.26 × 14 =
24. 24.15 × 18 =
25. 25.17 × 14 =
26. 26.21 × 18 =
27. 27.45 × 14 =
28. 28.40 × 15 =
29. 29.25 × 18 =
30. 30.12 × 18 =
31. 31.49 × 24 =
32. 32.20 × 18 =
33. 33.31 × 24 =
34. 34.22 × 14 =
35. 35.47 × 15 =
36. 36.31 × 14 =
37. 37.22 × 12 =
38. 38.32 × 15 =
39. 39.27 × 12 =
40. 40.38 × 18 =

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