Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 636 · 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. 1.49 × 18 =
2. 2.43 × 12 =
3. 3.32 × 14 =
4. 4.11 × 14 =
5. 5.26 × 16 =
6. 6.16 × 24 =
7. 7.33 × 24 =
8. 8.37 × 15 =
9. 9.11 × 12 =
10. 10.39 × 24 =
11. 11.17 × 18 =
12. 12.14 × 24 =
13. 13.24 × 18 =
14. 14.47 × 12 =
15. 15.15 × 15 =
16. 16.42 × 15 =
17. 17.36 × 15 =
18. 18.13 × 12 =
19. 19.45 × 14 =
20. 20.43 × 16 =
21. 21.27 × 15 =
22. 22.19 × 12 =
23. 23.48 × 12 =
24. 24.24 × 14 =
25. 25.47 × 15 =
26. 26.41 × 12 =
27. 27.30 × 24 =
28. 28.42 × 24 =
29. 29.46 × 16 =
30. 30.37 × 16 =
31. 31.40 × 15 =
32. 32.41 × 16 =
33. 33.42 × 18 =
34. 34.46 × 14 =
35. 35.18 × 15 =
36. 36.28 × 18 =
37. 37.19 × 18 =
38. 38.13 × 18 =
39. 39.21 × 18 =
40. 40.43 × 18 =

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