Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 78 · 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. 1.18 × 24 =
2. 2.19 × 16 =
3. 3.38 × 15 =
4. 4.42 × 18 =
5. 5.11 × 14 =
6. 6.44 × 16 =
7. 7.37 × 16 =
8. 8.36 × 14 =
9. 9.31 × 16 =
10. 10.33 × 18 =
11. 11.11 × 15 =
12. 12.16 × 14 =
13. 13.38 × 18 =
14. 14.29 × 15 =
15. 15.25 × 18 =
16. 16.25 × 12 =
17. 17.16 × 16 =
18. 18.41 × 15 =
19. 19.22 × 24 =
20. 20.37 × 15 =
21. 21.49 × 12 =
22. 22.34 × 18 =
23. 23.42 × 16 =
24. 24.39 × 24 =
25. 25.12 × 14 =
26. 26.46 × 12 =
27. 27.19 × 14 =
28. 28.34 × 24 =
29. 29.40 × 12 =
30. 30.29 × 14 =
31. 31.12 × 15 =
32. 32.17 × 12 =
33. 33.18 × 18 =
34. 34.18 × 16 =
35. 35.34 × 14 =
36. 36.22 × 18 =
37. 37.25 × 24 =
38. 38.11 × 18 =
39. 39.28 × 24 =
40. 40.32 × 16 =

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