Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 976 · 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. 1.18 × 14 =
2. 2.46 × 24 =
3. 3.40 × 24 =
4. 4.47 × 24 =
5. 5.34 × 14 =
6. 6.18 × 16 =
7. 7.15 × 15 =
8. 8.15 × 18 =
9. 9.18 × 12 =
10. 10.27 × 18 =
11. 11.47 × 12 =
12. 12.38 × 15 =
13. 13.31 × 14 =
14. 14.18 × 15 =
15. 15.14 × 14 =
16. 16.13 × 15 =
17. 17.42 × 16 =
18. 18.12 × 16 =
19. 19.17 × 16 =
20. 20.43 × 14 =
21. 21.39 × 18 =
22. 22.48 × 12 =
23. 23.49 × 15 =
24. 24.39 × 15 =
25. 25.30 × 14 =
26. 26.32 × 24 =
27. 27.46 × 15 =
28. 28.34 × 18 =
29. 29.41 × 12 =
30. 30.32 × 12 =
31. 31.33 × 15 =
32. 32.27 × 16 =
33. 33.22 × 14 =
34. 34.17 × 15 =
35. 35.40 × 18 =
36. 36.43 × 12 =
37. 37.46 × 16 =
38. 38.43 × 16 =
39. 39.39 × 14 =
40. 40.37 × 14 =

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