Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 901 · 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. 1.40 × 24 =
2. 2.14 × 12 =
3. 3.25 × 14 =
4. 4.29 × 18 =
5. 5.39 × 18 =
6. 6.47 × 16 =
7. 7.48 × 12 =
8. 8.22 × 14 =
9. 9.18 × 15 =
10. 10.42 × 24 =
11. 11.22 × 12 =
12. 12.46 × 12 =
13. 13.49 × 16 =
14. 14.21 × 14 =
15. 15.47 × 12 =
16. 16.15 × 24 =
17. 17.40 × 15 =
18. 18.15 × 14 =
19. 19.23 × 24 =
20. 20.49 × 24 =
21. 21.14 × 16 =
22. 22.25 × 24 =
23. 23.15 × 15 =
24. 24.32 × 16 =
25. 25.35 × 15 =
26. 26.22 × 24 =
27. 27.39 × 24 =
28. 28.29 × 12 =
29. 29.18 × 12 =
30. 30.43 × 24 =
31. 31.11 × 18 =
32. 32.17 × 14 =
33. 33.40 × 14 =
34. 34.17 × 18 =
35. 35.26 × 14 =
36. 36.27 × 12 =
37. 37.40 × 12 =
38. 38.28 × 15 =
39. 39.45 × 15 =
40. 40.13 × 24 =

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