Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 704 · 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. 1.17 × 12 =
2. 2.39 × 18 =
3. 3.47 × 18 =
4. 4.26 × 12 =
5. 5.17 × 24 =
6. 6.32 × 14 =
7. 7.14 × 18 =
8. 8.38 × 24 =
9. 9.22 × 16 =
10. 10.18 × 12 =
11. 11.13 × 18 =
12. 12.13 × 16 =
13. 13.15 × 15 =
14. 14.30 × 12 =
15. 15.32 × 18 =
16. 16.44 × 15 =
17. 17.41 × 12 =
18. 18.33 × 14 =
19. 19.46 × 14 =
20. 20.21 × 14 =
21. 21.33 × 12 =
22. 22.22 × 15 =
23. 23.29 × 24 =
24. 24.20 × 12 =
25. 25.37 × 18 =
26. 26.27 × 24 =
27. 27.26 × 24 =
28. 28.33 × 15 =
29. 29.12 × 16 =
30. 30.27 × 16 =
31. 31.48 × 14 =
32. 32.42 × 16 =
33. 33.16 × 12 =
34. 34.17 × 18 =
35. 35.17 × 15 =
36. 36.17 × 14 =
37. 37.38 × 14 =
38. 38.31 × 24 =
39. 39.49 × 12 =
40. 40.15 × 14 =

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