Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 990 · 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 × 24 =
2. 2.25 × 12 =
3. 3.40 × 24 =
4. 4.49 × 15 =
5. 5.40 × 18 =
6. 6.28 × 12 =
7. 7.17 × 15 =
8. 8.48 × 24 =
9. 9.33 × 18 =
10. 10.49 × 24 =
11. 11.13 × 15 =
12. 12.13 × 24 =
13. 13.30 × 12 =
14. 14.37 × 18 =
15. 15.46 × 15 =
16. 16.41 × 15 =
17. 17.14 × 12 =
18. 18.15 × 24 =
19. 19.14 × 24 =
20. 20.18 × 16 =
21. 21.34 × 24 =
22. 22.33 × 15 =
23. 23.27 × 24 =
24. 24.46 × 18 =
25. 25.23 × 14 =
26. 26.29 × 12 =
27. 27.25 × 16 =
28. 28.49 × 18 =
29. 29.27 × 12 =
30. 30.44 × 24 =
31. 31.26 × 15 =
32. 32.20 × 24 =
33. 33.13 × 18 =
34. 34.28 × 16 =
35. 35.23 × 24 =
36. 36.44 × 12 =
37. 37.19 × 12 =
38. 38.14 × 16 =
39. 39.28 × 24 =
40. 40.26 × 14 =

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