Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 479 · 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. 1.45 × 15 =
2. 2.37 × 24 =
3. 3.40 × 14 =
4. 4.28 × 18 =
5. 5.49 × 16 =
6. 6.39 × 24 =
7. 7.24 × 12 =
8. 8.13 × 24 =
9. 9.43 × 15 =
10. 10.31 × 18 =
11. 11.49 × 14 =
12. 12.41 × 12 =
13. 13.47 × 12 =
14. 14.28 × 12 =
15. 15.36 × 12 =
16. 16.45 × 24 =
17. 17.28 × 14 =
18. 18.47 × 16 =
19. 19.45 × 18 =
20. 20.19 × 16 =
21. 21.21 × 16 =
22. 22.12 × 14 =
23. 23.15 × 24 =
24. 24.11 × 14 =
25. 25.46 × 24 =
26. 26.17 × 14 =
27. 27.11 × 12 =
28. 28.29 × 12 =
29. 29.36 × 14 =
30. 30.16 × 16 =
31. 31.24 × 18 =
32. 32.48 × 24 =
33. 33.35 × 12 =
34. 34.39 × 14 =
35. 35.27 × 14 =
36. 36.23 × 15 =
37. 37.27 × 24 =
38. 38.13 × 12 =
39. 39.21 × 12 =
40. 40.17 × 12 =

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