Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 539 · 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. 1.20 × 24 =
2. 2.29 × 24 =
3. 3.49 × 15 =
4. 4.44 × 12 =
5. 5.37 × 15 =
6. 6.18 × 14 =
7. 7.32 × 15 =
8. 8.20 × 18 =
9. 9.33 × 16 =
10. 10.36 × 14 =
11. 11.26 × 16 =
12. 12.23 × 15 =
13. 13.34 × 18 =
14. 14.39 × 12 =
15. 15.13 × 12 =
16. 16.17 × 12 =
17. 17.38 × 14 =
18. 18.38 × 12 =
19. 19.25 × 16 =
20. 20.31 × 18 =
21. 21.33 × 15 =
22. 22.22 × 12 =
23. 23.16 × 15 =
24. 24.14 × 24 =
25. 25.47 × 16 =
26. 26.12 × 15 =
27. 27.11 × 12 =
28. 28.17 × 14 =
29. 29.28 × 24 =
30. 30.32 × 24 =
31. 31.24 × 14 =
32. 32.28 × 14 =
33. 33.13 × 14 =
34. 34.36 × 12 =
35. 35.34 × 24 =
36. 36.47 × 14 =
37. 37.40 × 24 =
38. 38.40 × 12 =
39. 39.38 × 15 =
40. 40.38 × 18 =

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