Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 146 · 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. 1.41 × 18 =
2. 2.23 × 14 =
3. 3.27 × 16 =
4. 4.22 × 14 =
5. 5.41 × 12 =
6. 6.46 × 15 =
7. 7.14 × 12 =
8. 8.16 × 16 =
9. 9.17 × 12 =
10. 10.44 × 14 =
11. 11.15 × 18 =
12. 12.39 × 12 =
13. 13.14 × 18 =
14. 14.32 × 12 =
15. 15.19 × 12 =
16. 16.14 × 14 =
17. 17.38 × 15 =
18. 18.40 × 14 =
19. 19.30 × 15 =
20. 20.36 × 16 =
21. 21.38 × 24 =
22. 22.28 × 24 =
23. 23.48 × 24 =
24. 24.29 × 12 =
25. 25.11 × 16 =
26. 26.38 × 14 =
27. 27.48 × 14 =
28. 28.31 × 18 =
29. 29.20 × 16 =
30. 30.38 × 18 =
31. 31.42 × 18 =
32. 32.12 × 18 =
33. 33.47 × 16 =
34. 34.15 × 12 =
35. 35.48 × 16 =
36. 36.13 × 18 =
37. 37.15 × 14 =
38. 38.39 × 16 =
39. 39.46 × 14 =
40. 40.34 × 14 =

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