Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 10 · 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 × 15 =
2. 2.21 × 24 =
3. 3.11 × 14 =
4. 4.12 × 24 =
5. 5.20 × 12 =
6. 6.29 × 24 =
7. 7.32 × 16 =
8. 8.25 × 14 =
9. 9.21 × 14 =
10. 10.20 × 14 =
11. 11.48 × 12 =
12. 12.23 × 12 =
13. 13.19 × 14 =
14. 14.14 × 18 =
15. 15.37 × 14 =
16. 16.46 × 15 =
17. 17.22 × 16 =
18. 18.19 × 18 =
19. 19.26 × 16 =
20. 20.24 × 24 =
21. 21.39 × 12 =
22. 22.22 × 18 =
23. 23.15 × 14 =
24. 24.18 × 15 =
25. 25.44 × 12 =
26. 26.14 × 12 =
27. 27.16 × 18 =
28. 28.48 × 24 =
29. 29.39 × 14 =
30. 30.18 × 18 =
31. 31.16 × 24 =
32. 32.28 × 16 =
33. 33.33 × 15 =
34. 34.41 × 16 =
35. 35.29 × 18 =
36. 36.20 × 15 =
37. 37.41 × 14 =
38. 38.23 × 18 =
39. 39.22 × 12 =
40. 40.26 × 18 =

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