Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 924 · 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. 2.12 × 18 =
3. 3.31 × 12 =
4. 4.32 × 15 =
5. 5.11 × 18 =
6. 6.27 × 12 =
7. 7.16 × 18 =
8. 8.23 × 12 =
9. 9.48 × 12 =
10. 10.13 × 16 =
11. 11.22 × 15 =
12. 12.29 × 15 =
13. 13.37 × 12 =
14. 14.11 × 24 =
15. 15.27 × 18 =
16. 16.17 × 14 =
17. 17.48 × 18 =
18. 18.30 × 12 =
19. 19.17 × 24 =
20. 20.30 × 18 =
21. 21.12 × 24 =
22. 22.49 × 24 =
23. 23.13 × 15 =
24. 24.41 × 15 =
25. 25.19 × 12 =
26. 26.11 × 12 =
27. 27.33 × 12 =
28. 28.14 × 18 =
29. 29.15 × 18 =
30. 30.19 × 14 =
31. 31.36 × 14 =
32. 32.30 × 14 =
33. 33.46 × 15 =
34. 34.35 × 24 =
35. 35.27 × 15 =
36. 36.48 × 15 =
37. 37.43 × 24 =
38. 38.33 × 14 =
39. 39.15 × 15 =
40. 40.14 × 12 =

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