Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 415 · 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. 1.44 × 18 =
2. 2.48 × 16 =
3. 3.27 × 18 =
4. 4.18 × 12 =
5. 5.44 × 24 =
6. 6.49 × 12 =
7. 7.32 × 14 =
8. 8.16 × 15 =
9. 9.17 × 15 =
10. 10.31 × 16 =
11. 11.13 × 14 =
12. 12.39 × 18 =
13. 13.21 × 15 =
14. 14.31 × 12 =
15. 15.26 × 14 =
16. 16.14 × 14 =
17. 17.28 × 16 =
18. 18.39 × 14 =
19. 19.30 × 18 =
20. 20.32 × 16 =
21. 21.48 × 24 =
22. 22.22 × 14 =
23. 23.19 × 14 =
24. 24.41 × 24 =
25. 25.24 × 24 =
26. 26.23 × 14 =
27. 27.16 × 18 =
28. 28.36 × 18 =
29. 29.49 × 24 =
30. 30.47 × 18 =
31. 31.18 × 18 =
32. 32.42 × 16 =
33. 33.12 × 12 =
34. 34.33 × 14 =
35. 35.38 × 24 =
36. 36.33 × 16 =
37. 37.24 × 12 =
38. 38.17 × 12 =
39. 39.43 × 24 =
40. 40.37 × 14 =

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