Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 675 · 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. 1.29 × 24 =
2. 2.16 × 15 =
3. 3.36 × 24 =
4. 4.39 × 14 =
5. 5.49 × 16 =
6. 6.29 × 15 =
7. 7.24 × 18 =
8. 8.20 × 12 =
9. 9.27 × 12 =
10. 10.11 × 14 =
11. 11.19 × 12 =
12. 12.40 × 12 =
13. 13.22 × 14 =
14. 14.25 × 12 =
15. 15.34 × 24 =
16. 16.45 × 14 =
17. 17.16 × 14 =
18. 18.23 × 15 =
19. 19.31 × 14 =
20. 20.26 × 14 =
21. 21.12 × 18 =
22. 22.46 × 15 =
23. 23.39 × 15 =
24. 24.47 × 14 =
25. 25.44 × 18 =
26. 26.27 × 15 =
27. 27.42 × 14 =
28. 28.44 × 14 =
29. 29.11 × 15 =
30. 30.21 × 15 =
31. 31.33 × 16 =
32. 32.32 × 18 =
33. 33.11 × 18 =
34. 34.20 × 18 =
35. 35.18 × 15 =
36. 36.29 × 12 =
37. 37.16 × 24 =
38. 38.43 × 12 =
39. 39.39 × 16 =
40. 40.13 × 16 =

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