Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 742 · 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 × 12 =
2. 2.34 × 16 =
3. 3.36 × 18 =
4. 4.13 × 18 =
5. 5.35 × 24 =
6. 6.49 × 16 =
7. 7.33 × 15 =
8. 8.37 × 12 =
9. 9.43 × 18 =
10. 10.43 × 24 =
11. 11.39 × 16 =
12. 12.22 × 14 =
13. 13.12 × 14 =
14. 14.48 × 12 =
15. 15.46 × 14 =
16. 16.40 × 24 =
17. 17.44 × 14 =
18. 18.44 × 24 =
19. 19.11 × 15 =
20. 20.46 × 12 =
21. 21.49 × 18 =
22. 22.21 × 16 =
23. 23.25 × 15 =
24. 24.28 × 15 =
25. 25.32 × 16 =
26. 26.11 × 16 =
27. 27.44 × 18 =
28. 28.18 × 14 =
29. 29.14 × 18 =
30. 30.24 × 12 =
31. 31.14 × 12 =
32. 32.20 × 12 =
33. 33.39 × 14 =
34. 34.39 × 15 =
35. 35.16 × 12 =
36. 36.35 × 18 =
37. 37.42 × 24 =
38. 38.13 × 16 =
39. 39.30 × 15 =
40. 40.46 × 24 =

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