Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 687 · 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. 1.28 × 24 =
2. 2.46 × 18 =
3. 3.22 × 24 =
4. 4.35 × 16 =
5. 5.22 × 16 =
6. 6.30 × 15 =
7. 7.46 × 15 =
8. 8.27 × 12 =
9. 9.44 × 12 =
10. 10.13 × 12 =
11. 11.20 × 14 =
12. 12.27 × 16 =
13. 13.42 × 14 =
14. 14.21 × 18 =
15. 15.37 × 14 =
16. 16.41 × 24 =
17. 17.12 × 15 =
18. 18.26 × 24 =
19. 19.39 × 15 =
20. 20.33 × 14 =
21. 21.29 × 16 =
22. 22.34 × 15 =
23. 23.17 × 15 =
24. 24.25 × 16 =
25. 25.20 × 24 =
26. 26.18 × 14 =
27. 27.15 × 18 =
28. 28.12 × 14 =
29. 29.36 × 12 =
30. 30.19 × 14 =
31. 31.11 × 18 =
32. 32.17 × 18 =
33. 33.36 × 18 =
34. 34.24 × 24 =
35. 35.21 × 12 =
36. 36.25 × 14 =
37. 37.45 × 15 =
38. 38.42 × 12 =
39. 39.18 × 15 =
40. 40.29 × 15 =

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