Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 291 · 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. 1.49 × 18 =
2. 2.39 × 16 =
3. 3.48 × 18 =
4. 4.12 × 14 =
5. 5.45 × 18 =
6. 6.20 × 14 =
7. 7.44 × 24 =
8. 8.14 × 24 =
9. 9.32 × 16 =
10. 10.41 × 18 =
11. 11.15 × 18 =
12. 12.24 × 15 =
13. 13.12 × 16 =
14. 14.48 × 12 =
15. 15.41 × 12 =
16. 16.14 × 18 =
17. 17.42 × 12 =
18. 18.29 × 12 =
19. 19.19 × 12 =
20. 20.12 × 24 =
21. 21.23 × 12 =
22. 22.38 × 15 =
23. 23.49 × 14 =
24. 24.41 × 16 =
25. 25.45 × 24 =
26. 26.35 × 12 =
27. 27.46 × 24 =
28. 28.42 × 14 =
29. 29.46 × 12 =
30. 30.33 × 18 =
31. 31.13 × 12 =
32. 32.32 × 12 =
33. 33.47 × 14 =
34. 34.22 × 15 =
35. 35.31 × 16 =
36. 36.39 × 12 =
37. 37.38 × 24 =
38. 38.33 × 24 =
39. 39.41 × 15 =
40. 40.38 × 18 =

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