Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 192 · 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. 1.14 × 24 =
2. 2.46 × 18 =
3. 3.17 × 12 =
4. 4.37 × 18 =
5. 5.13 × 12 =
6. 6.33 × 24 =
7. 7.42 × 15 =
8. 8.44 × 14 =
9. 9.40 × 12 =
10. 10.21 × 14 =
11. 11.24 × 12 =
12. 12.47 × 15 =
13. 13.42 × 18 =
14. 14.33 × 16 =
15. 15.18 × 14 =
16. 16.17 × 24 =
17. 17.32 × 16 =
18. 18.43 × 12 =
19. 19.37 × 16 =
20. 20.14 × 14 =
21. 21.22 × 16 =
22. 22.19 × 24 =
23. 23.25 × 12 =
24. 24.44 × 15 =
25. 25.41 × 12 =
26. 26.32 × 18 =
27. 27.21 × 18 =
28. 28.34 × 12 =
29. 29.17 × 18 =
30. 30.15 × 15 =
31. 31.15 × 16 =
32. 32.24 × 18 =
33. 33.26 × 16 =
34. 34.27 × 12 =
35. 35.11 × 18 =
36. 36.39 × 18 =
37. 37.17 × 14 =
38. 38.21 × 16 =
39. 39.22 × 14 =
40. 40.34 × 16 =

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