Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 880 · 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. 1.31 × 12 =
2. 2.39 × 14 =
3. 3.27 × 16 =
4. 4.38 × 18 =
5. 5.30 × 24 =
6. 6.19 × 14 =
7. 7.33 × 12 =
8. 8.25 × 12 =
9. 9.16 × 15 =
10. 10.29 × 14 =
11. 11.33 × 15 =
12. 12.22 × 12 =
13. 13.17 × 24 =
14. 14.29 × 24 =
15. 15.21 × 14 =
16. 16.27 × 15 =
17. 17.27 × 14 =
18. 18.35 × 18 =
19. 19.24 × 24 =
20. 20.35 × 24 =
21. 21.17 × 14 =
22. 22.31 × 14 =
23. 23.23 × 18 =
24. 24.11 × 12 =
25. 25.34 × 18 =
26. 26.23 × 24 =
27. 27.19 × 24 =
28. 28.15 × 15 =
29. 29.42 × 14 =
30. 30.37 × 12 =
31. 31.31 × 24 =
32. 32.19 × 15 =
33. 33.27 × 12 =
34. 34.13 × 15 =
35. 35.34 × 14 =
36. 36.24 × 12 =
37. 37.47 × 14 =
38. 38.26 × 24 =
39. 39.24 × 15 =
40. 40.48 × 18 =

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