Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 115 · 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. 1.40 × 18 =
2. 2.21 × 15 =
3. 3.28 × 18 =
4. 4.16 × 12 =
5. 5.45 × 12 =
6. 6.41 × 16 =
7. 7.46 × 12 =
8. 8.20 × 14 =
9. 9.30 × 18 =
10. 10.41 × 18 =
11. 11.39 × 24 =
12. 12.11 × 18 =
13. 13.20 × 18 =
14. 14.15 × 12 =
15. 15.44 × 14 =
16. 16.14 × 14 =
17. 17.49 × 14 =
18. 18.16 × 15 =
19. 19.41 × 12 =
20. 20.42 × 15 =
21. 21.21 × 16 =
22. 22.27 × 14 =
23. 23.43 × 18 =
24. 24.44 × 15 =
25. 25.12 × 15 =
26. 26.39 × 18 =
27. 27.38 × 12 =
28. 28.31 × 14 =
29. 29.18 × 12 =
30. 30.33 × 12 =
31. 31.34 × 16 =
32. 32.16 × 24 =
33. 33.32 × 16 =
34. 34.46 × 18 =
35. 35.28 × 24 =
36. 36.39 × 14 =
37. 37.22 × 12 =
38. 38.30 × 16 =
39. 39.24 × 16 =
40. 40.47 × 18 =

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