Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 311 · 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. 1.47 × 18 =
2. 2.42 × 14 =
3. 3.40 × 24 =
4. 4.41 × 12 =
5. 5.26 × 14 =
6. 6.32 × 24 =
7. 7.42 × 24 =
8. 8.21 × 14 =
9. 9.38 × 12 =
10. 10.21 × 12 =
11. 11.17 × 18 =
12. 12.33 × 15 =
13. 13.30 × 12 =
14. 14.25 × 18 =
15. 15.48 × 18 =
16. 16.29 × 18 =
17. 17.40 × 12 =
18. 18.24 × 14 =
19. 19.13 × 12 =
20. 20.36 × 12 =
21. 21.17 × 15 =
22. 22.18 × 15 =
23. 23.36 × 14 =
24. 24.16 × 16 =
25. 25.29 × 15 =
26. 26.40 × 14 =
27. 27.33 × 16 =
28. 28.11 × 24 =
29. 29.31 × 14 =
30. 30.20 × 16 =
31. 31.32 × 15 =
32. 32.12 × 14 =
33. 33.47 × 14 =
34. 34.11 × 15 =
35. 35.48 × 14 =
36. 36.13 × 18 =
37. 37.20 × 12 =
38. 38.43 × 24 =
39. 39.22 × 12 =
40. 40.15 × 12 =

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