Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 22 · 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. 1.36 × 24 =
2. 2.49 × 18 =
3. 3.14 × 15 =
4. 4.38 × 24 =
5. 5.42 × 14 =
6. 6.23 × 16 =
7. 7.49 × 12 =
8. 8.14 × 18 =
9. 9.27 × 14 =
10. 10.31 × 12 =
11. 11.32 × 16 =
12. 12.39 × 16 =
13. 13.22 × 14 =
14. 14.46 × 16 =
15. 15.14 × 24 =
16. 16.25 × 14 =
17. 17.31 × 14 =
18. 18.47 × 18 =
19. 19.39 × 15 =
20. 20.21 × 18 =
21. 21.22 × 15 =
22. 22.29 × 24 =
23. 23.37 × 16 =
24. 24.17 × 24 =
25. 25.41 × 12 =
26. 26.21 × 12 =
27. 27.24 × 15 =
28. 28.18 × 12 =
29. 29.12 × 16 =
30. 30.18 × 24 =
31. 31.21 × 24 =
32. 32.43 × 18 =
33. 33.26 × 14 =
34. 34.33 × 18 =
35. 35.16 × 14 =
36. 36.13 × 16 =
37. 37.32 × 12 =
38. 38.29 × 16 =
39. 39.46 × 15 =
40. 40.38 × 16 =

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