Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 521 · 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. 2.36 × 14 =
3. 3.14 × 16 =
4. 4.42 × 12 =
5. 5.25 × 14 =
6. 6.14 × 14 =
7. 7.39 × 24 =
8. 8.39 × 12 =
9. 9.21 × 18 =
10. 10.45 × 14 =
11. 11.47 × 24 =
12. 12.25 × 24 =
13. 13.43 × 16 =
14. 14.36 × 15 =
15. 15.18 × 24 =
16. 16.25 × 15 =
17. 17.49 × 14 =
18. 18.12 × 24 =
19. 19.17 × 12 =
20. 20.47 × 15 =
21. 21.38 × 18 =
22. 22.27 × 12 =
23. 23.35 × 15 =
24. 24.33 × 24 =
25. 25.25 × 16 =
26. 26.27 × 15 =
27. 27.26 × 24 =
28. 28.36 × 12 =
29. 29.23 × 14 =
30. 30.19 × 12 =
31. 31.46 × 15 =
32. 32.35 × 12 =
33. 33.12 × 16 =
34. 34.29 × 18 =
35. 35.13 × 15 =
36. 36.29 × 24 =
37. 37.14 × 12 =
38. 38.40 × 16 =
39. 39.17 × 24 =
40. 40.31 × 12 =

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