Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 156 · 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. 1.29 × 15 =
2. 2.43 × 14 =
3. 3.15 × 15 =
4. 4.17 × 14 =
5. 5.23 × 14 =
6. 6.45 × 18 =
7. 7.42 × 24 =
8. 8.42 × 14 =
9. 9.23 × 12 =
10. 10.20 × 16 =
11. 11.21 × 15 =
12. 12.16 × 12 =
13. 13.17 × 16 =
14. 14.33 × 15 =
15. 15.21 × 16 =
16. 16.47 × 14 =
17. 17.15 × 14 =
18. 18.40 × 16 =
19. 19.31 × 12 =
20. 20.30 × 12 =
21. 21.22 × 24 =
22. 22.11 × 14 =
23. 23.18 × 15 =
24. 24.47 × 16 =
25. 25.16 × 24 =
26. 26.17 × 15 =
27. 27.16 × 15 =
28. 28.28 × 18 =
29. 29.11 × 24 =
30. 30.35 × 12 =
31. 31.13 × 24 =
32. 32.36 × 14 =
33. 33.12 × 15 =
34. 34.21 × 24 =
35. 35.35 × 15 =
36. 36.21 × 14 =
37. 37.37 × 15 =
38. 38.46 × 12 =
39. 39.45 × 16 =
40. 40.27 × 18 =

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