Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 129 · 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. 1.44 × 15 =
2. 2.27 × 12 =
3. 3.46 × 18 =
4. 4.11 × 16 =
5. 5.48 × 16 =
6. 6.45 × 14 =
7. 7.18 × 15 =
8. 8.46 × 24 =
9. 9.48 × 12 =
10. 10.25 × 14 =
11. 11.49 × 16 =
12. 12.18 × 14 =
13. 13.43 × 16 =
14. 14.21 × 15 =
15. 15.12 × 16 =
16. 16.40 × 16 =
17. 17.22 × 15 =
18. 18.43 × 24 =
19. 19.36 × 18 =
20. 20.29 × 14 =
21. 21.31 × 14 =
22. 22.17 × 15 =
23. 23.21 × 12 =
24. 24.14 × 15 =
25. 25.12 × 12 =
26. 26.11 × 15 =
27. 27.28 × 16 =
28. 28.16 × 24 =
29. 29.20 × 12 =
30. 30.26 × 24 =
31. 31.44 × 12 =
32. 32.13 × 18 =
33. 33.31 × 12 =
34. 34.21 × 18 =
35. 35.13 × 24 =
36. 36.15 × 14 =
37. 37.33 × 15 =
38. 38.42 × 18 =
39. 39.16 × 18 =
40. 40.14 × 16 =

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