Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 892 · 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. 1.45 × 12 =
2. 2.40 × 18 =
3. 3.25 × 15 =
4. 4.47 × 16 =
5. 5.19 × 18 =
6. 6.31 × 14 =
7. 7.13 × 24 =
8. 8.11 × 14 =
9. 9.35 × 12 =
10. 10.30 × 12 =
11. 11.21 × 14 =
12. 12.11 × 15 =
13. 13.18 × 15 =
14. 14.49 × 14 =
15. 15.44 × 18 =
16. 16.39 × 12 =
17. 17.41 × 14 =
18. 18.12 × 24 =
19. 19.37 × 12 =
20. 20.38 × 12 =
21. 21.14 × 14 =
22. 22.33 × 24 =
23. 23.34 × 14 =
24. 24.30 × 16 =
25. 25.29 × 12 =
26. 26.42 × 12 =
27. 27.48 × 14 =
28. 28.22 × 14 =
29. 29.32 × 15 =
30. 30.45 × 14 =
31. 31.45 × 16 =
32. 32.17 × 24 =
33. 33.16 × 16 =
34. 34.43 × 24 =
35. 35.27 × 15 =
36. 36.30 × 15 =
37. 37.48 × 15 =
38. 38.46 × 18 =
39. 39.21 × 16 =
40. 40.17 × 12 =

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