Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 593 · 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. 1.15 × 15 =
2. 2.25 × 15 =
3. 3.38 × 12 =
4. 4.43 × 12 =
5. 5.30 × 16 =
6. 6.33 × 14 =
7. 7.16 × 12 =
8. 8.12 × 16 =
9. 9.49 × 24 =
10. 10.18 × 14 =
11. 11.20 × 12 =
12. 12.15 × 14 =
13. 13.11 × 12 =
14. 14.17 × 14 =
15. 15.25 × 16 =
16. 16.17 × 16 =
17. 17.22 × 12 =
18. 18.46 × 14 =
19. 19.30 × 15 =
20. 20.15 × 12 =
21. 21.20 × 18 =
22. 22.41 × 16 =
23. 23.27 × 16 =
24. 24.35 × 12 =
25. 25.13 × 24 =
26. 26.49 × 15 =
27. 27.21 × 18 =
28. 28.32 × 12 =
29. 29.14 × 18 =
30. 30.31 × 18 =
31. 31.39 × 24 =
32. 32.40 × 15 =
33. 33.48 × 14 =
34. 34.48 × 15 =
35. 35.34 × 12 =
36. 36.32 × 24 =
37. 37.35 × 18 =
38. 38.32 × 14 =
39. 39.30 × 12 =
40. 40.18 × 18 =

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