Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 685 · 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. 1.47 × 12 =
2. 2.27 × 15 =
3. 3.20 × 24 =
4. 4.41 × 16 =
5. 5.27 × 14 =
6. 6.23 × 15 =
7. 7.25 × 12 =
8. 8.31 × 12 =
9. 9.46 × 12 =
10. 10.30 × 18 =
11. 11.44 × 12 =
12. 12.24 × 12 =
13. 13.24 × 24 =
14. 14.42 × 16 =
15. 15.43 × 24 =
16. 16.41 × 14 =
17. 17.46 × 18 =
18. 18.28 × 12 =
19. 19.24 × 14 =
20. 20.28 × 18 =
21. 21.24 × 15 =
22. 22.29 × 14 =
23. 23.42 × 24 =
24. 24.40 × 12 =
25. 25.36 × 18 =
26. 26.27 × 12 =
27. 27.14 × 15 =
28. 28.33 × 16 =
29. 29.39 × 16 =
30. 30.16 × 12 =
31. 31.41 × 24 =
32. 32.23 × 18 =
33. 33.18 × 15 =
34. 34.24 × 16 =
35. 35.44 × 18 =
36. 36.46 × 24 =
37. 37.22 × 16 =
38. 38.49 × 16 =
39. 39.13 × 18 =
40. 40.25 × 14 =

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