Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 313 · 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. 1.46 × 18 =
2. 2.36 × 14 =
3. 3.39 × 15 =
4. 4.35 × 16 =
5. 5.17 × 15 =
6. 6.34 × 14 =
7. 7.32 × 15 =
8. 8.28 × 15 =
9. 9.40 × 24 =
10. 10.24 × 12 =
11. 11.49 × 15 =
12. 12.21 × 16 =
13. 13.31 × 24 =
14. 14.25 × 16 =
15. 15.11 × 14 =
16. 16.46 × 15 =
17. 17.47 × 12 =
18. 18.20 × 18 =
19. 19.24 × 16 =
20. 20.35 × 15 =
21. 21.38 × 16 =
22. 22.37 × 16 =
23. 23.40 × 16 =
24. 24.43 × 15 =
25. 25.41 × 12 =
26. 26.14 × 15 =
27. 27.49 × 14 =
28. 28.15 × 15 =
29. 29.33 × 15 =
30. 30.44 × 24 =
31. 31.16 × 14 =
32. 32.17 × 12 =
33. 33.47 × 16 =
34. 34.38 × 18 =
35. 35.29 × 18 =
36. 36.22 × 24 =
37. 37.28 × 18 =
38. 38.21 × 18 =
39. 39.34 × 18 =
40. 40.34 × 16 =

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