Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 188 · 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. 2.27 × 15 =
3. 3.41 × 12 =
4. 4.17 × 24 =
5. 5.14 × 12 =
6. 6.34 × 24 =
7. 7.27 × 24 =
8. 8.31 × 24 =
9. 9.18 × 12 =
10. 10.28 × 14 =
11. 11.37 × 18 =
12. 12.29 × 12 =
13. 13.24 × 24 =
14. 14.20 × 14 =
15. 15.16 × 18 =
16. 16.39 × 18 =
17. 17.35 × 24 =
18. 18.17 × 14 =
19. 19.42 × 12 =
20. 20.14 × 14 =
21. 21.23 × 15 =
22. 22.46 × 18 =
23. 23.11 × 12 =
24. 24.26 × 14 =
25. 25.30 × 12 =
26. 26.44 × 15 =
27. 27.13 × 16 =
28. 28.30 × 14 =
29. 29.46 × 16 =
30. 30.47 × 15 =
31. 31.16 × 24 =
32. 32.37 × 12 =
33. 33.26 × 18 =
34. 34.19 × 24 =
35. 35.44 × 12 =
36. 36.11 × 14 =
37. 37.39 × 14 =
38. 38.15 × 12 =
39. 39.15 × 16 =
40. 40.39 × 16 =

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