Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 83 · 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. 2.29 × 16 =
3. 3.23 × 12 =
4. 4.32 × 12 =
5. 5.31 × 15 =
6. 6.16 × 24 =
7. 7.46 × 14 =
8. 8.12 × 24 =
9. 9.17 × 15 =
10. 10.17 × 16 =
11. 11.14 × 14 =
12. 12.15 × 15 =
13. 13.34 × 14 =
14. 14.41 × 18 =
15. 15.32 × 18 =
16. 16.35 × 16 =
17. 17.35 × 14 =
18. 18.40 × 18 =
19. 19.25 × 12 =
20. 20.25 × 15 =
21. 21.22 × 14 =
22. 22.31 × 24 =
23. 23.43 × 12 =
24. 24.33 × 18 =
25. 25.20 × 12 =
26. 26.12 × 18 =
27. 27.11 × 12 =
28. 28.48 × 12 =
29. 29.23 × 14 =
30. 30.41 × 15 =
31. 31.44 × 24 =
32. 32.27 × 18 =
33. 33.21 × 24 =
34. 34.49 × 12 =
35. 35.36 × 15 =
36. 36.25 × 18 =
37. 37.28 × 24 =
38. 38.27 × 12 =
39. 39.40 × 14 =
40. 40.29 × 18 =

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