Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 204 · 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. 1.28 × 12 =
2. 2.32 × 24 =
3. 3.49 × 24 =
4. 4.42 × 12 =
5. 5.17 × 18 =
6. 6.44 × 16 =
7. 7.27 × 14 =
8. 8.38 × 12 =
9. 9.35 × 12 =
10. 10.21 × 16 =
11. 11.12 × 24 =
12. 12.23 × 16 =
13. 13.45 × 12 =
14. 14.16 × 16 =
15. 15.47 × 18 =
16. 16.25 × 14 =
17. 17.27 × 18 =
18. 18.29 × 14 =
19. 19.24 × 16 =
20. 20.11 × 15 =
21. 21.26 × 18 =
22. 22.42 × 16 =
23. 23.20 × 24 =
24. 24.24 × 14 =
25. 25.21 × 12 =
26. 26.19 × 18 =
27. 27.18 × 18 =
28. 28.47 × 14 =
29. 29.39 × 14 =
30. 30.13 × 15 =
31. 31.20 × 18 =
32. 32.12 × 12 =
33. 33.14 × 15 =
34. 34.49 × 14 =
35. 35.43 × 18 =
36. 36.46 × 12 =
37. 37.41 × 24 =
38. 38.38 × 24 =
39. 39.41 × 14 =
40. 40.29 × 15 =

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