Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 74 · 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. 1.48 × 24 =
2. 2.35 × 12 =
3. 3.49 × 16 =
4. 4.29 × 15 =
5. 5.33 × 15 =
6. 6.25 × 14 =
7. 7.47 × 14 =
8. 8.41 × 15 =
9. 9.18 × 18 =
10. 10.38 × 18 =
11. 11.17 × 18 =
12. 12.20 × 18 =
13. 13.22 × 18 =
14. 14.30 × 16 =
15. 15.37 × 12 =
16. 16.46 × 14 =
17. 17.40 × 24 =
18. 18.16 × 14 =
19. 19.40 × 12 =
20. 20.31 × 15 =
21. 21.18 × 24 =
22. 22.15 × 24 =
23. 23.22 × 14 =
24. 24.44 × 24 =
25. 25.28 × 12 =
26. 26.29 × 24 =
27. 27.24 × 16 =
28. 28.31 × 14 =
29. 29.36 × 12 =
30. 30.15 × 12 =
31. 31.41 × 18 =
32. 32.30 × 14 =
33. 33.44 × 14 =
34. 34.39 × 12 =
35. 35.30 × 12 =
36. 36.41 × 14 =
37. 37.37 × 14 =
38. 38.43 × 15 =
39. 39.46 × 12 =
40. 40.21 × 24 =

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