Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 524 · 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 × 14 =
3. 3.31 × 15 =
4. 4.29 × 24 =
5. 5.33 × 18 =
6. 6.32 × 15 =
7. 7.45 × 24 =
8. 8.36 × 18 =
9. 9.14 × 14 =
10. 10.44 × 16 =
11. 11.43 × 14 =
12. 12.12 × 15 =
13. 13.19 × 12 =
14. 14.37 × 12 =
15. 15.11 × 12 =
16. 16.17 × 12 =
17. 17.38 × 14 =
18. 18.30 × 15 =
19. 19.28 × 16 =
20. 20.45 × 16 =
21. 21.48 × 15 =
22. 22.39 × 18 =
23. 23.21 × 14 =
24. 24.16 × 14 =
25. 25.41 × 12 =
26. 26.25 × 12 =
27. 27.42 × 14 =
28. 28.20 × 16 =
29. 29.28 × 24 =
30. 30.16 × 15 =
31. 31.22 × 16 =
32. 32.35 × 24 =
33. 33.35 × 12 =
34. 34.47 × 14 =
35. 35.20 × 15 =
36. 36.40 × 15 =
37. 37.43 × 15 =
38. 38.31 × 14 =
39. 39.37 × 18 =
40. 40.14 × 16 =

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