Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 162 · 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. 1.14 × 24 =
2. 2.15 × 24 =
3. 3.36 × 15 =
4. 4.14 × 18 =
5. 5.47 × 14 =
6. 6.29 × 18 =
7. 7.11 × 12 =
8. 8.13 × 12 =
9. 9.30 × 24 =
10. 10.11 × 15 =
11. 11.45 × 24 =
12. 12.42 × 14 =
13. 13.31 × 15 =
14. 14.36 × 14 =
15. 15.37 × 14 =
16. 16.14 × 12 =
17. 17.31 × 18 =
18. 18.18 × 12 =
19. 19.14 × 14 =
20. 20.45 × 18 =
21. 21.32 × 18 =
22. 22.12 × 15 =
23. 23.32 × 24 =
24. 24.47 × 16 =
25. 25.49 × 12 =
26. 26.44 × 14 =
27. 27.25 × 24 =
28. 28.15 × 16 =
29. 29.41 × 12 =
30. 30.39 × 14 =
31. 31.22 × 24 =
32. 32.33 × 14 =
33. 33.13 × 16 =
34. 34.21 × 24 =
35. 35.36 × 24 =
36. 36.12 × 12 =
37. 37.39 × 18 =
38. 38.29 × 14 =
39. 39.11 × 18 =
40. 40.38 × 18 =

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