Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 406 · 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. 1.33 × 18 =
2. 2.20 × 24 =
3. 3.41 × 24 =
4. 4.14 × 12 =
5. 5.34 × 18 =
6. 6.21 × 15 =
7. 7.32 × 18 =
8. 8.13 × 24 =
9. 9.42 × 18 =
10. 10.11 × 14 =
11. 11.17 × 24 =
12. 12.33 × 15 =
13. 13.36 × 18 =
14. 14.30 × 14 =
15. 15.46 × 14 =
16. 16.15 × 14 =
17. 17.34 × 12 =
18. 18.11 × 24 =
19. 19.15 × 24 =
20. 20.39 × 16 =
21. 21.13 × 15 =
22. 22.15 × 15 =
23. 23.13 × 14 =
24. 24.42 × 24 =
25. 25.46 × 15 =
26. 26.47 × 15 =
27. 27.15 × 16 =
28. 28.30 × 15 =
29. 29.22 × 12 =
30. 30.19 × 14 =
31. 31.48 × 15 =
32. 32.23 × 18 =
33. 33.29 × 12 =
34. 34.17 × 12 =
35. 35.47 × 12 =
36. 36.44 × 24 =
37. 37.29 × 18 =
38. 38.36 × 14 =
39. 39.21 × 14 =
40. 40.37 × 15 =

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