Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 387 · 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 × 12 =
2. 2.35 × 15 =
3. 3.21 × 12 =
4. 4.16 × 12 =
5. 5.39 × 14 =
6. 6.39 × 16 =
7. 7.36 × 18 =
8. 8.32 × 15 =
9. 9.13 × 24 =
10. 10.19 × 14 =
11. 11.21 × 16 =
12. 12.15 × 12 =
13. 13.28 × 24 =
14. 14.25 × 24 =
15. 15.26 × 16 =
16. 16.35 × 16 =
17. 17.22 × 18 =
18. 18.47 × 12 =
19. 19.32 × 24 =
20. 20.11 × 15 =
21. 21.47 × 16 =
22. 22.26 × 18 =
23. 23.25 × 14 =
24. 24.43 × 18 =
25. 25.17 × 12 =
26. 26.34 × 24 =
27. 27.22 × 16 =
28. 28.20 × 24 =
29. 29.12 × 24 =
30. 30.26 × 12 =
31. 31.38 × 12 =
32. 32.38 × 15 =
33. 33.33 × 12 =
34. 34.40 × 24 =
35. 35.35 × 14 =
36. 36.15 × 24 =
37. 37.47 × 15 =
38. 38.16 × 14 =
39. 39.12 × 14 =
40. 40.45 × 18 =

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