Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 571 · 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. 2.39 × 14 =
3. 3.46 × 12 =
4. 4.49 × 24 =
5. 5.38 × 24 =
6. 6.13 × 14 =
7. 7.21 × 15 =
8. 8.28 × 12 =
9. 9.13 × 15 =
10. 10.44 × 12 =
11. 11.29 × 18 =
12. 12.16 × 14 =
13. 13.25 × 14 =
14. 14.24 × 12 =
15. 15.11 × 12 =
16. 16.18 × 15 =
17. 17.33 × 16 =
18. 18.38 × 18 =
19. 19.34 × 16 =
20. 20.43 × 12 =
21. 21.23 × 24 =
22. 22.48 × 24 =
23. 23.45 × 12 =
24. 24.19 × 24 =
25. 25.44 × 24 =
26. 26.48 × 16 =
27. 27.19 × 15 =
28. 28.29 × 15 =
29. 29.16 × 12 =
30. 30.49 × 18 =
31. 31.37 × 14 =
32. 32.19 × 16 =
33. 33.30 × 16 =
34. 34.49 × 16 =
35. 35.33 × 18 =
36. 36.20 × 12 =
37. 37.37 × 15 =
38. 38.41 × 14 =
39. 39.17 × 18 =
40. 40.18 × 24 =

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