Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 242 · 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. 1.45 × 18 =
2. 2.48 × 12 =
3. 3.11 × 14 =
4. 4.18 × 18 =
5. 5.22 × 15 =
6. 6.27 × 12 =
7. 7.31 × 16 =
8. 8.22 × 24 =
9. 9.32 × 16 =
10. 10.12 × 16 =
11. 11.46 × 14 =
12. 12.38 × 15 =
13. 13.16 × 15 =
14. 14.43 × 12 =
15. 15.28 × 24 =
16. 16.44 × 24 =
17. 17.40 × 14 =
18. 18.41 × 14 =
19. 19.33 × 12 =
20. 20.23 × 16 =
21. 21.32 × 12 =
22. 22.26 × 12 =
23. 23.14 × 14 =
24. 24.42 × 14 =
25. 25.24 × 24 =
26. 26.36 × 16 =
27. 27.13 × 18 =
28. 28.34 × 14 =
29. 29.43 × 24 =
30. 30.20 × 18 =
31. 31.18 × 14 =
32. 32.40 × 18 =
33. 33.22 × 12 =
34. 34.27 × 15 =
35. 35.27 × 16 =
36. 36.23 × 18 =
37. 37.24 × 15 =
38. 38.35 × 18 =
39. 39.45 × 24 =
40. 40.25 × 18 =

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