Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 396 · 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. 1.27 × 24 =
2. 2.43 × 18 =
3. 3.38 × 24 =
4. 4.40 × 14 =
5. 5.18 × 24 =
6. 6.15 × 24 =
7. 7.39 × 15 =
8. 8.39 × 24 =
9. 9.14 × 12 =
10. 10.45 × 18 =
11. 11.16 × 24 =
12. 12.18 × 18 =
13. 13.24 × 24 =
14. 14.47 × 15 =
15. 15.23 × 16 =
16. 16.46 × 12 =
17. 17.40 × 24 =
18. 18.12 × 12 =
19. 19.28 × 18 =
20. 20.45 × 24 =
21. 21.22 × 18 =
22. 22.19 × 16 =
23. 23.49 × 16 =
24. 24.33 × 12 =
25. 25.11 × 16 =
26. 26.21 × 24 =
27. 27.19 × 18 =
28. 28.48 × 12 =
29. 29.42 × 15 =
30. 30.11 × 18 =
31. 31.34 × 15 =
32. 32.35 × 24 =
33. 33.15 × 14 =
34. 34.32 × 16 =
35. 35.14 × 14 =
36. 36.31 × 16 =
37. 37.23 × 12 =
38. 38.39 × 14 =
39. 39.17 × 15 =
40. 40.37 × 18 =

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