Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 994 · 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. 1.40 × 24 =
2. 2.49 × 18 =
3. 3.46 × 14 =
4. 4.18 × 14 =
5. 5.42 × 14 =
6. 6.21 × 24 =
7. 7.17 × 14 =
8. 8.19 × 18 =
9. 9.46 × 18 =
10. 10.41 × 16 =
11. 11.22 × 14 =
12. 12.38 × 24 =
13. 13.39 × 18 =
14. 14.49 × 16 =
15. 15.11 × 16 =
16. 16.40 × 12 =
17. 17.12 × 14 =
18. 18.43 × 14 =
19. 19.36 × 12 =
20. 20.49 × 15 =
21. 21.41 × 14 =
22. 22.48 × 12 =
23. 23.40 × 15 =
24. 24.46 × 12 =
25. 25.15 × 14 =
26. 26.14 × 15 =
27. 27.14 × 16 =
28. 28.14 × 14 =
29. 29.36 × 14 =
30. 30.41 × 15 =
31. 31.48 × 18 =
32. 32.18 × 15 =
33. 33.44 × 14 =
34. 34.42 × 15 =
35. 35.41 × 12 =
36. 36.22 × 18 =
37. 37.29 × 12 =
38. 38.17 × 18 =
39. 39.43 × 24 =
40. 40.21 × 16 =

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