Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 82 · 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. 1.47 × 18 =
2. 2.40 × 18 =
3. 3.24 × 12 =
4. 4.13 × 16 =
5. 5.13 × 24 =
6. 6.45 × 18 =
7. 7.38 × 18 =
8. 8.33 × 15 =
9. 9.40 × 16 =
10. 10.20 × 15 =
11. 11.33 × 24 =
12. 12.22 × 18 =
13. 13.46 × 15 =
14. 14.39 × 24 =
15. 15.21 × 16 =
16. 16.49 × 24 =
17. 17.25 × 12 =
18. 18.18 × 15 =
19. 19.22 × 15 =
20. 20.27 × 12 =
21. 21.42 × 24 =
22. 22.45 × 14 =
23. 23.15 × 12 =
24. 24.21 × 14 =
25. 25.16 × 18 =
26. 26.23 × 14 =
27. 27.15 × 16 =
28. 28.26 × 12 =
29. 29.17 × 14 =
30. 30.23 × 24 =
31. 31.41 × 18 =
32. 32.34 × 24 =
33. 33.24 × 18 =
34. 34.19 × 18 =
35. 35.47 × 14 =
36. 36.39 × 12 =
37. 37.48 × 24 =
38. 38.43 × 24 =
39. 39.33 × 12 =
40. 40.22 × 24 =

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