Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 491 · 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. 2.35 × 12 =
3. 3.40 × 12 =
4. 4.23 × 14 =
5. 5.18 × 12 =
6. 6.41 × 14 =
7. 7.34 × 18 =
8. 8.33 × 16 =
9. 9.39 × 12 =
10. 10.27 × 12 =
11. 11.11 × 15 =
12. 12.43 × 18 =
13. 13.41 × 24 =
14. 14.29 × 12 =
15. 15.40 × 14 =
16. 16.18 × 14 =
17. 17.29 × 14 =
18. 18.49 × 14 =
19. 19.24 × 18 =
20. 20.35 × 14 =
21. 21.32 × 12 =
22. 22.37 × 24 =
23. 23.40 × 15 =
24. 24.44 × 18 =
25. 25.22 × 18 =
26. 26.37 × 18 =
27. 27.45 × 12 =
28. 28.14 × 16 =
29. 29.37 × 14 =
30. 30.13 × 24 =
31. 31.30 × 14 =
32. 32.19 × 15 =
33. 33.15 × 15 =
34. 34.13 × 16 =
35. 35.21 × 24 =
36. 36.32 × 15 =
37. 37.31 × 12 =
38. 38.17 × 12 =
39. 39.41 × 12 =
40. 40.32 × 14 =

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