Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 326 · 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 × 18 =
2. 2.21 × 12 =
3. 3.42 × 15 =
4. 4.11 × 14 =
5. 5.30 × 15 =
6. 6.40 × 24 =
7. 7.17 × 12 =
8. 8.38 × 12 =
9. 9.14 × 16 =
10. 10.25 × 16 =
11. 11.33 × 16 =
12. 12.17 × 18 =
13. 13.48 × 16 =
14. 14.29 × 16 =
15. 15.43 × 18 =
16. 16.21 × 24 =
17. 17.49 × 12 =
18. 18.13 × 18 =
19. 19.49 × 24 =
20. 20.19 × 15 =
21. 21.14 × 14 =
22. 22.14 × 18 =
23. 23.16 × 12 =
24. 24.48 × 12 =
25. 25.44 × 18 =
26. 26.25 × 15 =
27. 27.39 × 14 =
28. 28.16 × 14 =
29. 29.25 × 12 =
30. 30.44 × 16 =
31. 31.46 × 16 =
32. 32.21 × 14 =
33. 33.32 × 12 =
34. 34.39 × 24 =
35. 35.15 × 14 =
36. 36.41 × 16 =
37. 37.18 × 14 =
38. 38.40 × 12 =
39. 39.33 × 12 =
40. 40.32 × 14 =

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