Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 903 · 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. 1.41 × 24 =
2. 2.45 × 24 =
3. 3.42 × 12 =
4. 4.29 × 15 =
5. 5.37 × 16 =
6. 6.44 × 24 =
7. 7.29 × 14 =
8. 8.46 × 15 =
9. 9.38 × 12 =
10. 10.25 × 24 =
11. 11.22 × 15 =
12. 12.47 × 15 =
13. 13.49 × 14 =
14. 14.35 × 15 =
15. 15.36 × 15 =
16. 16.16 × 14 =
17. 17.30 × 18 =
18. 18.46 × 16 =
19. 19.47 × 14 =
20. 20.28 × 14 =
21. 21.11 × 14 =
22. 22.13 × 16 =
23. 23.49 × 24 =
24. 24.33 × 15 =
25. 25.39 × 14 =
26. 26.32 × 15 =
27. 27.41 × 14 =
28. 28.20 × 24 =
29. 29.24 × 15 =
30. 30.40 × 12 =
31. 31.43 × 12 =
32. 32.24 × 16 =
33. 33.45 × 18 =
34. 34.25 × 15 =
35. 35.22 × 18 =
36. 36.17 × 12 =
37. 37.26 × 14 =
38. 38.22 × 16 =
39. 39.29 × 16 =
40. 40.29 × 24 =

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