Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 980 · 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. 1.43 × 18 =
2. 2.12 × 15 =
3. 3.15 × 24 =
4. 4.36 × 16 =
5. 5.49 × 15 =
6. 6.22 × 12 =
7. 7.49 × 12 =
8. 8.24 × 15 =
9. 9.19 × 18 =
10. 10.24 × 12 =
11. 11.28 × 15 =
12. 12.13 × 12 =
13. 13.28 × 14 =
14. 14.16 × 15 =
15. 15.23 × 16 =
16. 16.49 × 14 =
17. 17.37 × 15 =
18. 18.41 × 14 =
19. 19.22 × 24 =
20. 20.33 × 16 =
21. 21.47 × 24 =
22. 22.36 × 15 =
23. 23.17 × 12 =
24. 24.23 × 12 =
25. 25.37 × 12 =
26. 26.40 × 18 =
27. 27.26 × 24 =
28. 28.48 × 15 =
29. 29.42 × 18 =
30. 30.29 × 12 =
31. 31.16 × 14 =
32. 32.14 × 16 =
33. 33.22 × 18 =
34. 34.21 × 14 =
35. 35.47 × 14 =
36. 36.47 × 16 =
37. 37.12 × 14 =
38. 38.37 × 16 =
39. 39.33 × 18 =
40. 40.33 × 14 =

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