Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 531 · 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. 1.42 × 24 =
2. 2.12 × 18 =
3. 3.47 × 14 =
4. 4.11 × 14 =
5. 5.33 × 16 =
6. 6.17 × 14 =
7. 7.46 × 24 =
8. 8.48 × 16 =
9. 9.44 × 18 =
10. 10.48 × 12 =
11. 11.28 × 16 =
12. 12.37 × 18 =
13. 13.22 × 15 =
14. 14.43 × 12 =
15. 15.29 × 24 =
16. 16.15 × 18 =
17. 17.39 × 15 =
18. 18.23 × 18 =
19. 19.30 × 12 =
20. 20.18 × 14 =
21. 21.39 × 14 =
22. 22.17 × 24 =
23. 23.49 × 18 =
24. 24.37 × 16 =
25. 25.31 × 15 =
26. 26.28 × 12 =
27. 27.43 × 18 =
28. 28.16 × 24 =
29. 29.45 × 24 =
30. 30.19 × 16 =
31. 31.49 × 15 =
32. 32.45 × 18 =
33. 33.33 × 15 =
34. 34.42 × 18 =
35. 35.28 × 15 =
36. 36.46 × 18 =
37. 37.20 × 15 =
38. 38.35 × 14 =
39. 39.31 × 12 =
40. 40.22 × 18 =

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