Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 180 · 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. 1.32 × 24 =
2. 2.44 × 14 =
3. 3.23 × 14 =
4. 4.13 × 16 =
5. 5.22 × 14 =
6. 6.12 × 24 =
7. 7.31 × 12 =
8. 8.16 × 24 =
9. 9.20 × 12 =
10. 10.39 × 16 =
11. 11.17 × 12 =
12. 12.45 × 24 =
13. 13.33 × 15 =
14. 14.43 × 24 =
15. 15.32 × 12 =
16. 16.11 × 24 =
17. 17.41 × 18 =
18. 18.48 × 16 =
19. 19.43 × 18 =
20. 20.12 × 14 =
21. 21.30 × 12 =
22. 22.20 × 18 =
23. 23.23 × 12 =
24. 24.21 × 12 =
25. 25.20 × 16 =
26. 26.42 × 16 =
27. 27.45 × 16 =
28. 28.22 × 18 =
29. 29.16 × 14 =
30. 30.16 × 15 =
31. 31.31 × 16 =
32. 32.42 × 15 =
33. 33.37 × 12 =
34. 34.33 × 12 =
35. 35.31 × 18 =
36. 36.30 × 15 =
37. 37.22 × 24 =
38. 38.33 × 24 =
39. 39.47 × 14 =
40. 40.44 × 12 =

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