Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 609 · 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. 1.25 × 15 =
2. 2.33 × 12 =
3. 3.41 × 14 =
4. 4.28 × 12 =
5. 5.47 × 18 =
6. 6.28 × 14 =
7. 7.26 × 15 =
8. 8.32 × 24 =
9. 9.31 × 12 =
10. 10.30 × 15 =
11. 11.39 × 12 =
12. 12.33 × 24 =
13. 13.38 × 14 =
14. 14.49 × 14 =
15. 15.40 × 16 =
16. 16.11 × 16 =
17. 17.12 × 14 =
18. 18.23 × 15 =
19. 19.47 × 24 =
20. 20.40 × 18 =
21. 21.40 × 24 =
22. 22.12 × 15 =
23. 23.49 × 24 =
24. 24.17 × 18 =
25. 25.35 × 14 =
26. 26.44 × 16 =
27. 27.39 × 15 =
28. 28.42 × 15 =
29. 29.49 × 18 =
30. 30.22 × 18 =
31. 31.49 × 15 =
32. 32.30 × 16 =
33. 33.41 × 15 =
34. 34.24 × 14 =
35. 35.36 × 24 =
36. 36.29 × 14 =
37. 37.41 × 12 =
38. 38.45 × 16 =
39. 39.15 × 14 =
40. 40.45 × 15 =

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