Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 934 · 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. 1.44 × 15 =
2. 2.39 × 18 =
3. 3.16 × 12 =
4. 4.35 × 16 =
5. 5.19 × 15 =
6. 6.30 × 12 =
7. 7.25 × 14 =
8. 8.47 × 18 =
9. 9.27 × 24 =
10. 10.40 × 16 =
11. 11.17 × 24 =
12. 12.28 × 24 =
13. 13.14 × 14 =
14. 14.46 × 16 =
15. 15.17 × 16 =
16. 16.42 × 18 =
17. 17.13 × 14 =
18. 18.22 × 24 =
19. 19.35 × 18 =
20. 20.26 × 12 =
21. 21.24 × 12 =
22. 22.44 × 14 =
23. 23.46 × 12 =
24. 24.15 × 14 =
25. 25.46 × 24 =
26. 26.38 × 16 =
27. 27.11 × 24 =
28. 28.24 × 24 =
29. 29.15 × 24 =
30. 30.38 × 12 =
31. 31.26 × 16 =
32. 32.33 × 16 =
33. 33.16 × 15 =
34. 34.44 × 16 =
35. 35.39 × 14 =
36. 36.27 × 12 =
37. 37.26 × 18 =
38. 38.42 × 14 =
39. 39.40 × 12 =
40. 40.35 × 12 =

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