Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 165 · 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. 1.30 × 15 =
2. 2.41 × 18 =
3. 3.24 × 15 =
4. 4.35 × 12 =
5. 5.21 × 14 =
6. 6.49 × 15 =
7. 7.29 × 14 =
8. 8.20 × 12 =
9. 9.33 × 16 =
10. 10.44 × 16 =
11. 11.23 × 18 =
12. 12.49 × 12 =
13. 13.43 × 14 =
14. 14.12 × 12 =
15. 15.39 × 16 =
16. 16.32 × 12 =
17. 17.40 × 18 =
18. 18.33 × 12 =
19. 19.22 × 18 =
20. 20.48 × 15 =
21. 21.15 × 12 =
22. 22.17 × 16 =
23. 23.21 × 15 =
24. 24.39 × 18 =
25. 25.42 × 18 =
26. 26.28 × 14 =
27. 27.40 × 16 =
28. 28.14 × 12 =
29. 29.40 × 14 =
30. 30.35 × 24 =
31. 31.28 × 24 =
32. 32.18 × 24 =
33. 33.31 × 14 =
34. 34.25 × 24 =
35. 35.45 × 24 =
36. 36.39 × 15 =
37. 37.48 × 24 =
38. 38.35 × 14 =
39. 39.19 × 16 =
40. 40.47 × 24 =

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