Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 60 · 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. 1.22 × 18 =
2. 2.43 × 12 =
3. 3.20 × 18 =
4. 4.22 × 12 =
5. 5.31 × 24 =
6. 6.48 × 18 =
7. 7.35 × 16 =
8. 8.17 × 16 =
9. 9.25 × 15 =
10. 10.14 × 24 =
11. 11.40 × 12 =
12. 12.14 × 18 =
13. 13.49 × 16 =
14. 14.49 × 15 =
15. 15.12 × 12 =
16. 16.19 × 15 =
17. 17.41 × 18 =
18. 18.37 × 15 =
19. 19.27 × 15 =
20. 20.46 × 14 =
21. 21.21 × 14 =
22. 22.25 × 16 =
23. 23.43 × 14 =
24. 24.13 × 12 =
25. 25.24 × 24 =
26. 26.39 × 12 =
27. 27.16 × 15 =
28. 28.31 × 12 =
29. 29.42 × 15 =
30. 30.24 × 12 =
31. 31.37 × 24 =
32. 32.12 × 18 =
33. 33.22 × 24 =
34. 34.24 × 18 =
35. 35.41 × 12 =
36. 36.38 × 24 =
37. 37.27 × 18 =
38. 38.19 × 16 =
39. 39.16 × 14 =
40. 40.23 × 16 =

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