Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 532 · 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. 2.41 × 18 =
3. 3.37 × 12 =
4. 4.13 × 12 =
5. 5.13 × 18 =
6. 6.15 × 12 =
7. 7.16 × 24 =
8. 8.33 × 12 =
9. 9.26 × 12 =
10. 10.15 × 14 =
11. 11.25 × 15 =
12. 12.11 × 16 =
13. 13.39 × 14 =
14. 14.47 × 15 =
15. 15.38 × 18 =
16. 16.15 × 15 =
17. 17.16 × 18 =
18. 18.37 × 18 =
19. 19.32 × 14 =
20. 20.38 × 14 =
21. 21.29 × 14 =
22. 22.26 × 14 =
23. 23.43 × 12 =
24. 24.15 × 16 =
25. 25.28 × 18 =
26. 26.27 × 15 =
27. 27.23 × 12 =
28. 28.40 × 24 =
29. 29.24 × 15 =
30. 30.22 × 24 =
31. 31.33 × 24 =
32. 32.36 × 12 =
33. 33.26 × 15 =
34. 34.22 × 14 =
35. 35.40 × 16 =
36. 36.46 × 12 =
37. 37.23 × 15 =
38. 38.27 × 12 =
39. 39.23 × 18 =
40. 40.11 × 14 =

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