Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 122 · 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. 1.24 × 15 =
2. 2.18 × 24 =
3. 3.28 × 14 =
4. 4.20 × 12 =
5. 5.24 × 12 =
6. 6.23 × 12 =
7. 7.45 × 24 =
8. 8.48 × 24 =
9. 9.32 × 24 =
10. 10.20 × 24 =
11. 11.31 × 18 =
12. 12.33 × 14 =
13. 13.11 × 14 =
14. 14.29 × 24 =
15. 15.27 × 16 =
16. 16.37 × 15 =
17. 17.41 × 16 =
18. 18.49 × 12 =
19. 19.28 × 18 =
20. 20.24 × 14 =
21. 21.49 × 24 =
22. 22.41 × 24 =
23. 23.24 × 24 =
24. 24.38 × 15 =
25. 25.15 × 16 =
26. 26.36 × 15 =
27. 27.36 × 24 =
28. 28.16 × 12 =
29. 29.17 × 15 =
30. 30.43 × 24 =
31. 31.26 × 16 =
32. 32.36 × 16 =
33. 33.11 × 12 =
34. 34.19 × 14 =
35. 35.42 × 12 =
36. 36.26 × 12 =
37. 37.21 × 18 =
38. 38.20 × 18 =
39. 39.14 × 16 =
40. 40.33 × 15 =

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