Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 305 · 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. 1.24 × 18 =
2. 2.18 × 18 =
3. 3.17 × 15 =
4. 4.28 × 12 =
5. 5.14 × 15 =
6. 6.16 × 15 =
7. 7.37 × 24 =
8. 8.33 × 15 =
9. 9.49 × 24 =
10. 10.39 × 18 =
11. 11.17 × 18 =
12. 12.18 × 14 =
13. 13.13 × 12 =
14. 14.18 × 12 =
15. 15.47 × 24 =
16. 16.41 × 12 =
17. 17.26 × 15 =
18. 18.19 × 12 =
19. 19.12 × 16 =
20. 20.42 × 12 =
21. 21.31 × 18 =
22. 22.15 × 15 =
23. 23.36 × 24 =
24. 24.32 × 16 =
25. 25.11 × 14 =
26. 26.34 × 16 =
27. 27.13 × 15 =
28. 28.27 × 12 =
29. 29.49 × 18 =
30. 30.23 × 18 =
31. 31.26 × 24 =
32. 32.18 × 15 =
33. 33.47 × 16 =
34. 34.12 × 12 =
35. 35.37 × 18 =
36. 36.40 × 24 =
37. 37.26 × 12 =
38. 38.16 × 12 =
39. 39.34 × 24 =
40. 40.42 × 16 =

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