Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 817 · 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. 1.27 × 18 =
2. 2.34 × 24 =
3. 3.24 × 16 =
4. 4.37 × 18 =
5. 5.20 × 16 =
6. 6.13 × 15 =
7. 7.16 × 12 =
8. 8.34 × 14 =
9. 9.12 × 24 =
10. 10.17 × 24 =
11. 11.36 × 24 =
12. 12.31 × 18 =
13. 13.42 × 14 =
14. 14.11 × 14 =
15. 15.11 × 12 =
16. 16.47 × 15 =
17. 17.31 × 24 =
18. 18.21 × 12 =
19. 19.36 × 16 =
20. 20.21 × 24 =
21. 21.19 × 18 =
22. 22.32 × 15 =
23. 23.33 × 24 =
24. 24.17 × 16 =
25. 25.17 × 14 =
26. 26.42 × 15 =
27. 27.15 × 12 =
28. 28.47 × 16 =
29. 29.39 × 24 =
30. 30.22 × 15 =
31. 31.12 × 12 =
32. 32.20 × 12 =
33. 33.13 × 16 =
34. 34.23 × 18 =
35. 35.13 × 12 =
36. 36.49 × 14 =
37. 37.39 × 15 =
38. 38.34 × 12 =
39. 39.26 × 15 =
40. 40.14 × 12 =

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