Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 84 · 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. 1.45 × 18 =
2. 2.45 × 12 =
3. 3.15 × 18 =
4. 4.26 × 24 =
5. 5.17 × 12 =
6. 6.14 × 24 =
7. 7.22 × 15 =
8. 8.28 × 16 =
9. 9.13 × 14 =
10. 10.49 × 24 =
11. 11.42 × 14 =
12. 12.31 × 14 =
13. 13.47 × 18 =
14. 14.39 × 16 =
15. 15.38 × 24 =
16. 16.19 × 16 =
17. 17.11 × 16 =
18. 18.32 × 24 =
19. 19.32 × 12 =
20. 20.34 × 18 =
21. 21.25 × 16 =
22. 22.31 × 12 =
23. 23.18 × 15 =
24. 24.33 × 15 =
25. 25.23 × 14 =
26. 26.47 × 16 =
27. 27.30 × 14 =
28. 28.26 × 14 =
29. 29.12 × 12 =
30. 30.37 × 12 =
31. 31.24 × 12 =
32. 32.40 × 14 =
33. 33.29 × 12 =
34. 34.25 × 15 =
35. 35.36 × 24 =
36. 36.11 × 14 =
37. 37.32 × 15 =
38. 38.22 × 12 =
39. 39.20 × 14 =
40. 40.41 × 24 =

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