Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 824 · 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. 1.34 × 18 =
2. 2.39 × 24 =
3. 3.24 × 15 =
4. 4.27 × 12 =
5. 5.20 × 14 =
6. 6.25 × 15 =
7. 7.38 × 18 =
8. 8.31 × 14 =
9. 9.22 × 18 =
10. 10.47 × 24 =
11. 11.47 × 14 =
12. 12.11 × 12 =
13. 13.37 × 16 =
14. 14.40 × 24 =
15. 15.41 × 15 =
16. 16.21 × 12 =
17. 17.35 × 12 =
18. 18.48 × 12 =
19. 19.33 × 24 =
20. 20.45 × 18 =
21. 21.22 × 24 =
22. 22.18 × 16 =
23. 23.36 × 24 =
24. 24.23 × 16 =
25. 25.37 × 24 =
26. 26.37 × 15 =
27. 27.45 × 14 =
28. 28.32 × 16 =
29. 29.49 × 24 =
30. 30.42 × 16 =
31. 31.22 × 14 =
32. 32.36 × 12 =
33. 33.32 × 14 =
34. 34.42 × 24 =
35. 35.42 × 14 =
36. 36.16 × 12 =
37. 37.35 × 24 =
38. 38.12 × 12 =
39. 39.21 × 15 =
40. 40.36 × 15 =

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