Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 2 · 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. 1.31 × 14 =
2. 2.30 × 24 =
3. 3.47 × 24 =
4. 4.22 × 24 =
5. 5.41 × 16 =
6. 6.11 × 12 =
7. 7.47 × 12 =
8. 8.39 × 12 =
9. 9.13 × 15 =
10. 10.21 × 24 =
11. 11.46 × 15 =
12. 12.37 × 15 =
13. 13.49 × 16 =
14. 14.23 × 12 =
15. 15.49 × 15 =
16. 16.12 × 14 =
17. 17.19 × 24 =
18. 18.31 × 18 =
19. 19.49 × 12 =
20. 20.24 × 18 =
21. 21.14 × 12 =
22. 22.38 × 14 =
23. 23.35 × 16 =
24. 24.42 × 24 =
25. 25.40 × 14 =
26. 26.14 × 14 =
27. 27.18 × 14 =
28. 28.47 × 16 =
29. 29.44 × 16 =
30. 30.42 × 16 =
31. 31.39 × 15 =
32. 32.35 × 15 =
33. 33.24 × 15 =
34. 34.39 × 14 =
35. 35.44 × 12 =
36. 36.32 × 18 =
37. 37.45 × 24 =
38. 38.29 × 12 =
39. 39.16 × 24 =
40. 40.48 × 16 =

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