Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 723 · 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. 1.41 × 24 =
2. 2.19 × 18 =
3. 3.22 × 12 =
4. 4.11 × 15 =
5. 5.41 × 16 =
6. 6.43 × 24 =
7. 7.15 × 18 =
8. 8.34 × 18 =
9. 9.46 × 15 =
10. 10.13 × 12 =
11. 11.39 × 24 =
12. 12.49 × 14 =
13. 13.18 × 12 =
14. 14.45 × 18 =
15. 15.34 × 16 =
16. 16.15 × 16 =
17. 17.14 × 15 =
18. 18.39 × 16 =
19. 19.20 × 12 =
20. 20.35 × 18 =
21. 21.45 × 16 =
22. 22.39 × 12 =
23. 23.20 × 15 =
24. 24.32 × 15 =
25. 25.38 × 18 =
26. 26.48 × 12 =
27. 27.21 × 16 =
28. 28.41 × 14 =
29. 29.46 × 12 =
30. 30.47 × 15 =
31. 31.27 × 14 =
32. 32.26 × 15 =
33. 33.49 × 15 =
34. 34.25 × 14 =
35. 35.26 × 24 =
36. 36.31 × 15 =
37. 37.33 × 18 =
38. 38.35 × 24 =
39. 39.25 × 18 =
40. 40.17 × 16 =

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