Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 93 · 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. 1.18 × 18 =
2. 2.47 × 14 =
3. 3.32 × 12 =
4. 4.29 × 24 =
5. 5.18 × 15 =
6. 6.28 × 12 =
7. 7.25 × 14 =
8. 8.18 × 14 =
9. 9.45 × 24 =
10. 10.47 × 15 =
11. 11.37 × 16 =
12. 12.21 × 12 =
13. 13.14 × 15 =
14. 14.19 × 18 =
15. 15.24 × 24 =
16. 16.23 × 12 =
17. 17.48 × 16 =
18. 18.26 × 15 =
19. 19.29 × 18 =
20. 20.37 × 24 =
21. 21.49 × 12 =
22. 22.29 × 12 =
23. 23.33 × 24 =
24. 24.45 × 14 =
25. 25.32 × 14 =
26. 26.39 × 15 =
27. 27.45 × 15 =
28. 28.29 × 15 =
29. 29.47 × 12 =
30. 30.37 × 15 =
31. 31.12 × 12 =
32. 32.38 × 12 =
33. 33.17 × 18 =
34. 34.41 × 14 =
35. 35.43 × 12 =
36. 36.17 × 24 =
37. 37.38 × 16 =
38. 38.22 × 12 =
39. 39.27 × 16 =
40. 40.31 × 12 =

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