Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 788 · 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 × 15 =
2. 2.44 × 14 =
3. 3.27 × 24 =
4. 4.27 × 12 =
5. 5.20 × 14 =
6. 6.21 × 18 =
7. 7.25 × 14 =
8. 8.15 × 16 =
9. 9.40 × 18 =
10. 10.42 × 15 =
11. 11.31 × 24 =
12. 12.38 × 15 =
13. 13.25 × 12 =
14. 14.35 × 14 =
15. 15.18 × 14 =
16. 16.40 × 15 =
17. 17.12 × 18 =
18. 18.18 × 24 =
19. 19.14 × 18 =
20. 20.12 × 24 =
21. 21.11 × 24 =
22. 22.34 × 16 =
23. 23.46 × 18 =
24. 24.31 × 16 =
25. 25.30 × 18 =
26. 26.37 × 12 =
27. 27.32 × 24 =
28. 28.20 × 18 =
29. 29.43 × 12 =
30. 30.16 × 18 =
31. 31.19 × 12 =
32. 32.39 × 15 =
33. 33.26 × 15 =
34. 34.20 × 12 =
35. 35.45 × 18 =
36. 36.38 × 16 =
37. 37.16 × 12 =
38. 38.25 × 15 =
39. 39.13 × 15 =
40. 40.39 × 18 =

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