Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 860 · 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. 1.15 × 12 =
2. 2.37 × 24 =
3. 3.13 × 14 =
4. 4.39 × 14 =
5. 5.40 × 14 =
6. 6.25 × 16 =
7. 7.17 × 24 =
8. 8.20 × 14 =
9. 9.42 × 12 =
10. 10.22 × 15 =
11. 11.33 × 15 =
12. 12.30 × 14 =
13. 13.43 × 12 =
14. 14.35 × 16 =
15. 15.21 × 16 =
16. 16.46 × 14 =
17. 17.14 × 15 =
18. 18.44 × 18 =
19. 19.12 × 12 =
20. 20.25 × 15 =
21. 21.13 × 15 =
22. 22.11 × 24 =
23. 23.42 × 16 =
24. 24.40 × 24 =
25. 25.25 × 14 =
26. 26.48 × 14 =
27. 27.31 × 15 =
28. 28.47 × 15 =
29. 29.37 × 18 =
30. 30.41 × 24 =
31. 31.11 × 14 =
32. 32.17 × 14 =
33. 33.20 × 12 =
34. 34.23 × 16 =
35. 35.29 × 18 =
36. 36.31 × 12 =
37. 37.36 × 18 =
38. 38.16 × 18 =
39. 39.34 × 12 =
40. 40.36 × 15 =

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