Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 399 · 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. 1.49 × 24 =
2. 2.43 × 16 =
3. 3.44 × 18 =
4. 4.16 × 24 =
5. 5.12 × 14 =
6. 6.44 × 24 =
7. 7.32 × 12 =
8. 8.39 × 24 =
9. 9.39 × 14 =
10. 10.46 × 14 =
11. 11.24 × 14 =
12. 12.25 × 18 =
13. 13.47 × 15 =
14. 14.37 × 14 =
15. 15.27 × 14 =
16. 16.21 × 18 =
17. 17.18 × 12 =
18. 18.21 × 12 =
19. 19.17 × 18 =
20. 20.38 × 16 =
21. 21.19 × 14 =
22. 22.30 × 24 =
23. 23.42 × 16 =
24. 24.18 × 18 =
25. 25.31 × 15 =
26. 26.40 × 14 =
27. 27.28 × 12 =
28. 28.19 × 12 =
29. 29.24 × 16 =
30. 30.49 × 16 =
31. 31.26 × 24 =
32. 32.38 × 15 =
33. 33.30 × 14 =
34. 34.22 × 18 =
35. 35.11 × 24 =
36. 36.28 × 18 =
37. 37.22 × 14 =
38. 38.47 × 12 =
39. 39.43 × 15 =
40. 40.29 × 18 =

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