Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 241 · 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. 1.12 × 18 =
2. 2.33 × 15 =
3. 3.22 × 24 =
4. 4.33 × 18 =
5. 5.41 × 15 =
6. 6.44 × 14 =
7. 7.13 × 12 =
8. 8.21 × 24 =
9. 9.16 × 18 =
10. 10.32 × 24 =
11. 11.48 × 12 =
12. 12.31 × 18 =
13. 13.18 × 18 =
14. 14.46 × 14 =
15. 15.40 × 24 =
16. 16.30 × 16 =
17. 17.26 × 12 =
18. 18.42 × 16 =
19. 19.49 × 12 =
20. 20.38 × 24 =
21. 21.29 × 18 =
22. 22.12 × 24 =
23. 23.23 × 24 =
24. 24.35 × 16 =
25. 25.21 × 16 =
26. 26.48 × 24 =
27. 27.47 × 12 =
28. 28.17 × 12 =
29. 29.25 × 12 =
30. 30.24 × 24 =
31. 31.25 × 18 =
32. 32.42 × 15 =
33. 33.43 × 24 =
34. 34.23 × 14 =
35. 35.29 × 24 =
36. 36.19 × 15 =
37. 37.26 × 16 =
38. 38.31 × 16 =
39. 39.29 × 14 =
40. 40.45 × 12 =

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