Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 568 · 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 × 14 =
2. 2.17 × 12 =
3. 3.11 × 15 =
4. 4.15 × 16 =
5. 5.21 × 15 =
6. 6.38 × 18 =
7. 7.33 × 24 =
8. 8.35 × 24 =
9. 9.31 × 15 =
10. 10.13 × 14 =
11. 11.13 × 12 =
12. 12.38 × 16 =
13. 13.27 × 15 =
14. 14.24 × 14 =
15. 15.21 × 12 =
16. 16.44 × 15 =
17. 17.44 × 14 =
18. 18.49 × 16 =
19. 19.39 × 15 =
20. 20.40 × 14 =
21. 21.42 × 15 =
22. 22.18 × 18 =
23. 23.33 × 12 =
24. 24.26 × 24 =
25. 25.14 × 12 =
26. 26.42 × 24 =
27. 27.14 × 15 =
28. 28.17 × 15 =
29. 29.48 × 18 =
30. 30.35 × 12 =
31. 31.41 × 18 =
32. 32.24 × 24 =
33. 33.23 × 15 =
34. 34.36 × 14 =
35. 35.36 × 15 =
36. 36.15 × 15 =
37. 37.39 × 18 =
38. 38.11 × 18 =
39. 39.23 × 18 =
40. 40.42 × 12 =

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