Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 281 · 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. 2.32 × 14 =
3. 3.28 × 15 =
4. 4.28 × 14 =
5. 5.24 × 16 =
6. 6.19 × 16 =
7. 7.31 × 14 =
8. 8.19 × 24 =
9. 9.26 × 14 =
10. 10.31 × 15 =
11. 11.40 × 14 =
12. 12.41 × 15 =
13. 13.45 × 12 =
14. 14.48 × 12 =
15. 15.35 × 24 =
16. 16.47 × 16 =
17. 17.40 × 12 =
18. 18.34 × 14 =
19. 19.11 × 18 =
20. 20.25 × 24 =
21. 21.42 × 15 =
22. 22.48 × 18 =
23. 23.21 × 16 =
24. 24.16 × 24 =
25. 25.13 × 12 =
26. 26.20 × 14 =
27. 27.22 × 16 =
28. 28.12 × 14 =
29. 29.18 × 15 =
30. 30.23 × 12 =
31. 31.14 × 16 =
32. 32.43 × 12 =
33. 33.33 × 12 =
34. 34.11 × 16 =
35. 35.35 × 15 =
36. 36.38 × 15 =
37. 37.18 × 18 =
38. 38.34 × 18 =
39. 39.29 × 15 =
40. 40.21 × 18 =

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