Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 24 · 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. 1.25 × 14 =
2. 2.30 × 18 =
3. 3.46 × 24 =
4. 4.49 × 24 =
5. 5.39 × 14 =
6. 6.16 × 24 =
7. 7.32 × 14 =
8. 8.45 × 12 =
9. 9.22 × 12 =
10. 10.31 × 14 =
11. 11.46 × 18 =
12. 12.36 × 24 =
13. 13.25 × 16 =
14. 14.13 × 16 =
15. 15.14 × 14 =
16. 16.48 × 14 =
17. 17.45 × 24 =
18. 18.38 × 12 =
19. 19.27 × 15 =
20. 20.20 × 14 =
21. 21.25 × 15 =
22. 22.17 × 18 =
23. 23.37 × 24 =
24. 24.33 × 16 =
25. 25.17 × 14 =
26. 26.41 × 18 =
27. 27.39 × 16 =
28. 28.14 × 18 =
29. 29.16 × 18 =
30. 30.46 × 14 =
31. 31.45 × 18 =
32. 32.46 × 12 =
33. 33.13 × 24 =
34. 34.46 × 16 =
35. 35.36 × 14 =
36. 36.18 × 16 =
37. 37.11 × 16 =
38. 38.35 × 24 =
39. 39.41 × 12 =
40. 40.16 × 15 =

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