Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 543 · 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. 1.13 × 24 =
2. 2.49 × 14 =
3. 3.38 × 14 =
4. 4.27 × 12 =
5. 5.21 × 12 =
6. 6.18 × 16 =
7. 7.14 × 14 =
8. 8.22 × 12 =
9. 9.49 × 15 =
10. 10.35 × 12 =
11. 11.19 × 18 =
12. 12.18 × 14 =
13. 13.24 × 14 =
14. 14.48 × 12 =
15. 15.44 × 24 =
16. 16.15 × 15 =
17. 17.33 × 12 =
18. 18.28 × 12 =
19. 19.20 × 18 =
20. 20.40 × 12 =
21. 21.22 × 24 =
22. 22.39 × 15 =
23. 23.46 × 12 =
24. 24.41 × 16 =
25. 25.32 × 24 =
26. 26.25 × 14 =
27. 27.18 × 15 =
28. 28.33 × 24 =
29. 29.41 × 24 =
30. 30.20 × 24 =
31. 31.41 × 18 =
32. 32.26 × 14 =
33. 33.46 × 15 =
34. 34.38 × 16 =
35. 35.19 × 12 =
36. 36.31 × 12 =
37. 37.23 × 15 =
38. 38.13 × 18 =
39. 39.26 × 24 =
40. 40.27 × 16 =

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