Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 522 · 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. 1.32 × 12 =
2. 2.41 × 14 =
3. 3.18 × 15 =
4. 4.11 × 16 =
5. 5.20 × 15 =
6. 6.19 × 18 =
7. 7.32 × 24 =
8. 8.13 × 24 =
9. 9.28 × 16 =
10. 10.15 × 18 =
11. 11.47 × 18 =
12. 12.23 × 16 =
13. 13.49 × 14 =
14. 14.14 × 18 =
15. 15.41 × 15 =
16. 16.38 × 16 =
17. 17.45 × 14 =
18. 18.22 × 16 =
19. 19.33 × 18 =
20. 20.40 × 24 =
21. 21.37 × 24 =
22. 22.39 × 18 =
23. 23.21 × 15 =
24. 24.39 × 16 =
25. 25.15 × 12 =
26. 26.32 × 18 =
27. 27.34 × 18 =
28. 28.45 × 15 =
29. 29.24 × 12 =
30. 30.17 × 24 =
31. 31.15 × 14 =
32. 32.26 × 12 =
33. 33.41 × 18 =
34. 34.14 × 24 =
35. 35.26 × 24 =
36. 36.30 × 18 =
37. 37.18 × 24 =
38. 38.30 × 14 =
39. 39.49 × 12 =
40. 40.24 × 18 =

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