Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 267 · 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. 1.21 × 15 =
2. 2.37 × 18 =
3. 3.19 × 12 =
4. 4.12 × 16 =
5. 5.17 × 12 =
6. 6.13 × 24 =
7. 7.22 × 18 =
8. 8.49 × 14 =
9. 9.16 × 16 =
10. 10.42 × 16 =
11. 11.21 × 14 =
12. 12.31 × 14 =
13. 13.41 × 14 =
14. 14.21 × 24 =
15. 15.18 × 16 =
16. 16.47 × 12 =
17. 17.49 × 18 =
18. 18.19 × 15 =
19. 19.32 × 12 =
20. 20.40 × 16 =
21. 21.21 × 16 =
22. 22.29 × 15 =
23. 23.43 × 12 =
24. 24.41 × 16 =
25. 25.48 × 12 =
26. 26.13 × 14 =
27. 27.39 × 14 =
28. 28.26 × 12 =
29. 29.40 × 14 =
30. 30.21 × 12 =
31. 31.28 × 16 =
32. 32.47 × 14 =
33. 33.49 × 24 =
34. 34.18 × 15 =
35. 35.11 × 12 =
36. 36.31 × 12 =
37. 37.33 × 15 =
38. 38.46 × 14 =
39. 39.43 × 14 =
40. 40.35 × 16 =

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