Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 956 · 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. 1.25 × 16 =
2. 2.41 × 12 =
3. 3.37 × 16 =
4. 4.39 × 18 =
5. 5.13 × 24 =
6. 6.44 × 14 =
7. 7.31 × 12 =
8. 8.40 × 15 =
9. 9.32 × 18 =
10. 10.35 × 16 =
11. 11.30 × 24 =
12. 12.43 × 14 =
13. 13.15 × 15 =
14. 14.14 × 15 =
15. 15.22 × 24 =
16. 16.18 × 12 =
17. 17.18 × 15 =
18. 18.11 × 15 =
19. 19.15 × 12 =
20. 20.26 × 16 =
21. 21.27 × 24 =
22. 22.38 × 14 =
23. 23.36 × 12 =
24. 24.16 × 14 =
25. 25.35 × 15 =
26. 26.38 × 15 =
27. 27.29 × 12 =
28. 28.13 × 12 =
29. 29.39 × 15 =
30. 30.39 × 12 =
31. 31.33 × 12 =
32. 32.14 × 18 =
33. 33.13 × 14 =
34. 34.16 × 24 =
35. 35.27 × 16 =
36. 36.27 × 12 =
37. 37.40 × 18 =
38. 38.47 × 12 =
39. 39.45 × 18 =
40. 40.25 × 18 =

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