Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 350 · 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. 1.12 × 12 =
2. 2.20 × 18 =
3. 3.40 × 24 =
4. 4.31 × 15 =
5. 5.27 × 15 =
6. 6.29 × 24 =
7. 7.24 × 18 =
8. 8.31 × 24 =
9. 9.15 × 15 =
10. 10.33 × 12 =
11. 11.46 × 12 =
12. 12.48 × 15 =
13. 13.37 × 24 =
14. 14.19 × 15 =
15. 15.19 × 16 =
16. 16.43 × 12 =
17. 17.15 × 18 =
18. 18.20 × 14 =
19. 19.13 × 12 =
20. 20.41 × 16 =
21. 21.39 × 14 =
22. 22.16 × 24 =
23. 23.39 × 12 =
24. 24.23 × 15 =
25. 25.48 × 16 =
26. 26.15 × 12 =
27. 27.42 × 18 =
28. 28.43 × 16 =
29. 29.18 × 18 =
30. 30.47 × 18 =
31. 31.12 × 18 =
32. 32.47 × 12 =
33. 33.32 × 18 =
34. 34.22 × 18 =
35. 35.24 × 14 =
36. 36.34 × 14 =
37. 37.14 × 18 =
38. 38.11 × 24 =
39. 39.37 × 16 =
40. 40.29 × 15 =

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