Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 697 · 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. 1.42 × 24 =
2. 2.33 × 24 =
3. 3.37 × 14 =
4. 4.30 × 18 =
5. 5.17 × 14 =
6. 6.34 × 24 =
7. 7.17 × 24 =
8. 8.22 × 12 =
9. 9.21 × 15 =
10. 10.12 × 15 =
11. 11.37 × 24 =
12. 12.41 × 24 =
13. 13.47 × 18 =
14. 14.17 × 12 =
15. 15.15 × 15 =
16. 16.13 × 12 =
17. 17.11 × 12 =
18. 18.42 × 18 =
19. 19.39 × 15 =
20. 20.15 × 18 =
21. 21.27 × 15 =
22. 22.37 × 18 =
23. 23.42 × 15 =
24. 24.12 × 24 =
25. 25.15 × 12 =
26. 26.49 × 24 =
27. 27.16 × 14 =
28. 28.38 × 12 =
29. 29.17 × 16 =
30. 30.40 × 15 =
31. 31.34 × 16 =
32. 32.29 × 24 =
33. 33.30 × 16 =
34. 34.45 × 15 =
35. 35.47 × 24 =
36. 36.39 × 12 =
37. 37.36 × 15 =
38. 38.45 × 18 =
39. 39.38 × 18 =
40. 40.28 × 14 =

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