Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 473 · 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. 2.49 × 24 =
3. 3.20 × 12 =
4. 4.35 × 18 =
5. 5.28 × 15 =
6. 6.43 × 16 =
7. 7.48 × 12 =
8. 8.26 × 15 =
9. 9.15 × 14 =
10. 10.13 × 18 =
11. 11.39 × 18 =
12. 12.46 × 14 =
13. 13.16 × 15 =
14. 14.17 × 16 =
15. 15.44 × 15 =
16. 16.33 × 16 =
17. 17.15 × 18 =
18. 18.38 × 16 =
19. 19.42 × 16 =
20. 20.20 × 14 =
21. 21.45 × 16 =
22. 22.42 × 14 =
23. 23.12 × 18 =
24. 24.12 × 12 =
25. 25.38 × 14 =
26. 26.19 × 18 =
27. 27.20 × 15 =
28. 28.47 × 14 =
29. 29.17 × 18 =
30. 30.16 × 16 =
31. 31.27 × 14 =
32. 32.45 × 12 =
33. 33.29 × 18 =
34. 34.19 × 14 =
35. 35.25 × 24 =
36. 36.48 × 16 =
37. 37.44 × 18 =
38. 38.17 × 15 =
39. 39.12 × 24 =
40. 40.12 × 16 =

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