Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 597 · 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. 2.25 × 15 =
3. 3.33 × 14 =
4. 4.36 × 12 =
5. 5.30 × 24 =
6. 6.39 × 14 =
7. 7.31 × 16 =
8. 8.16 × 12 =
9. 9.20 × 14 =
10. 10.18 × 14 =
11. 11.38 × 12 =
12. 12.49 × 24 =
13. 13.42 × 12 =
14. 14.35 × 12 =
15. 15.26 × 14 =
16. 16.39 × 12 =
17. 17.40 × 15 =
18. 18.15 × 24 =
19. 19.24 × 15 =
20. 20.24 × 14 =
21. 21.38 × 14 =
22. 22.46 × 15 =
23. 23.45 × 12 =
24. 24.12 × 16 =
25. 25.21 × 15 =
26. 26.30 × 12 =
27. 27.48 × 14 =
28. 28.11 × 12 =
29. 29.11 × 14 =
30. 30.39 × 18 =
31. 31.35 × 18 =
32. 32.11 × 18 =
33. 33.42 × 14 =
34. 34.45 × 14 =
35. 35.29 × 18 =
36. 36.13 × 14 =
37. 37.48 × 24 =
38. 38.15 × 15 =
39. 39.40 × 24 =
40. 40.36 × 24 =

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