Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 569 · 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. 1.40 × 12 =
2. 2.13 × 12 =
3. 3.45 × 15 =
4. 4.40 × 14 =
5. 5.45 × 24 =
6. 6.20 × 24 =
7. 7.30 × 18 =
8. 8.11 × 15 =
9. 9.15 × 18 =
10. 10.22 × 14 =
11. 11.49 × 24 =
12. 12.29 × 12 =
13. 13.42 × 15 =
14. 14.25 × 18 =
15. 15.32 × 14 =
16. 16.18 × 14 =
17. 17.18 × 12 =
18. 18.37 × 24 =
19. 19.16 × 16 =
20. 20.46 × 16 =
21. 21.44 × 18 =
22. 22.32 × 24 =
23. 23.49 × 15 =
24. 24.39 × 12 =
25. 25.21 × 24 =
26. 26.25 × 15 =
27. 27.22 × 16 =
28. 28.47 × 15 =
29. 29.15 × 15 =
30. 30.14 × 12 =
31. 31.18 × 24 =
32. 32.16 × 24 =
33. 33.14 × 14 =
34. 34.46 × 14 =
35. 35.48 × 14 =
36. 36.32 × 18 =
37. 37.36 × 16 =
38. 38.13 × 14 =
39. 39.31 × 15 =
40. 40.45 × 14 =

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