Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 792 · 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. 1.44 × 24 =
2. 2.42 × 15 =
3. 3.18 × 12 =
4. 4.19 × 12 =
5. 5.39 × 14 =
6. 6.45 × 14 =
7. 7.49 × 14 =
8. 8.20 × 24 =
9. 9.41 × 16 =
10. 10.28 × 24 =
11. 11.49 × 16 =
12. 12.16 × 15 =
13. 13.16 × 12 =
14. 14.13 × 14 =
15. 15.40 × 14 =
16. 16.12 × 14 =
17. 17.27 × 24 =
18. 18.39 × 15 =
19. 19.27 × 14 =
20. 20.32 × 15 =
21. 21.42 × 12 =
22. 22.27 × 12 =
23. 23.44 × 16 =
24. 24.39 × 16 =
25. 25.47 × 12 =
26. 26.24 × 14 =
27. 27.45 × 12 =
28. 28.33 × 14 =
29. 29.36 × 16 =
30. 30.28 × 14 =
31. 31.28 × 12 =
32. 32.15 × 12 =
33. 33.48 × 24 =
34. 34.41 × 18 =
35. 35.20 × 15 =
36. 36.15 × 14 =
37. 37.33 × 18 =
38. 38.30 × 16 =
39. 39.36 × 12 =
40. 40.39 × 12 =

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