Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 927 · 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. 1.18 × 15 =
2. 2.40 × 15 =
3. 3.35 × 14 =
4. 4.22 × 16 =
5. 5.43 × 12 =
6. 6.34 × 12 =
7. 7.39 × 12 =
8. 8.41 × 12 =
9. 9.15 × 15 =
10. 10.15 × 18 =
11. 11.49 × 14 =
12. 12.32 × 14 =
13. 13.32 × 18 =
14. 14.49 × 18 =
15. 15.48 × 14 =
16. 16.35 × 12 =
17. 17.14 × 24 =
18. 18.12 × 14 =
19. 19.49 × 24 =
20. 20.25 × 16 =
21. 21.24 × 14 =
22. 22.26 × 14 =
23. 23.25 × 18 =
24. 24.40 × 24 =
25. 25.26 × 12 =
26. 26.17 × 18 =
27. 27.23 × 15 =
28. 28.18 × 14 =
29. 29.24 × 16 =
30. 30.18 × 12 =
31. 31.31 × 24 =
32. 32.29 × 14 =
33. 33.39 × 24 =
34. 34.19 × 16 =
35. 35.41 × 14 =
36. 36.38 × 12 =
37. 37.13 × 14 =
38. 38.48 × 16 =
39. 39.21 × 15 =
40. 40.13 × 12 =

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