Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 682 · 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. 1.13 × 24 =
2. 2.25 × 16 =
3. 3.24 × 12 =
4. 4.22 × 18 =
5. 5.38 × 18 =
6. 6.36 × 24 =
7. 7.17 × 15 =
8. 8.49 × 15 =
9. 9.32 × 14 =
10. 10.27 × 12 =
11. 11.22 × 15 =
12. 12.41 × 15 =
13. 13.21 × 12 =
14. 14.33 × 15 =
15. 15.14 × 15 =
16. 16.36 × 12 =
17. 17.18 × 18 =
18. 18.13 × 12 =
19. 19.20 × 18 =
20. 20.19 × 12 =
21. 21.30 × 24 =
22. 22.13 × 15 =
23. 23.12 × 12 =
24. 24.45 × 18 =
25. 25.33 × 12 =
26. 26.27 × 16 =
27. 27.45 × 16 =
28. 28.37 × 15 =
29. 29.44 × 14 =
30. 30.11 × 14 =
31. 31.24 × 15 =
32. 32.17 × 18 =
33. 33.37 × 16 =
34. 34.28 × 12 =
35. 35.20 × 12 =
36. 36.28 × 15 =
37. 37.26 × 24 =
38. 38.18 × 16 =
39. 39.42 × 15 =
40. 40.37 × 24 =

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