Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 684 · 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. 1.41 × 24 =
2. 2.42 × 14 =
3. 3.33 × 12 =
4. 4.20 × 15 =
5. 5.11 × 12 =
6. 6.22 × 18 =
7. 7.17 × 18 =
8. 8.14 × 18 =
9. 9.11 × 24 =
10. 10.34 × 15 =
11. 11.19 × 24 =
12. 12.41 × 15 =
13. 13.46 × 14 =
14. 14.40 × 12 =
15. 15.16 × 12 =
16. 16.35 × 12 =
17. 17.13 × 15 =
18. 18.43 × 14 =
19. 19.39 × 18 =
20. 20.29 × 16 =
21. 21.40 × 24 =
22. 22.14 × 15 =
23. 23.30 × 14 =
24. 24.13 × 12 =
25. 25.22 × 24 =
26. 26.49 × 12 =
27. 27.14 × 14 =
28. 28.27 × 12 =
29. 29.34 × 18 =
30. 30.29 × 24 =
31. 31.27 × 15 =
32. 32.16 × 14 =
33. 33.42 × 16 =
34. 34.43 × 24 =
35. 35.36 × 12 =
36. 36.21 × 12 =
37. 37.21 × 14 =
38. 38.15 × 12 =
39. 39.23 × 16 =
40. 40.41 × 18 =

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