Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 719 · 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 × 24 =
2. 2.40 × 24 =
3. 3.24 × 12 =
4. 4.33 × 16 =
5. 5.47 × 12 =
6. 6.38 × 18 =
7. 7.43 × 18 =
8. 8.30 × 12 =
9. 9.41 × 14 =
10. 10.31 × 12 =
11. 11.27 × 18 =
12. 12.20 × 18 =
13. 13.38 × 12 =
14. 14.27 × 24 =
15. 15.37 × 14 =
16. 16.43 × 12 =
17. 17.24 × 16 =
18. 18.25 × 16 =
19. 19.38 × 15 =
20. 20.13 × 15 =
21. 21.21 × 18 =
22. 22.28 × 18 =
23. 23.11 × 14 =
24. 24.26 × 14 =
25. 25.39 × 12 =
26. 26.33 × 12 =
27. 27.45 × 12 =
28. 28.45 × 18 =
29. 29.19 × 15 =
30. 30.34 × 12 =
31. 31.28 × 14 =
32. 32.47 × 16 =
33. 33.12 × 16 =
34. 34.39 × 24 =
35. 35.23 × 14 =
36. 36.14 × 24 =
37. 37.17 × 24 =
38. 38.26 × 12 =
39. 39.41 × 16 =
40. 40.20 × 24 =

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