Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 679 · 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. 1.41 × 24 =
2. 2.31 × 18 =
3. 3.22 × 14 =
4. 4.47 × 16 =
5. 5.45 × 24 =
6. 6.13 × 24 =
7. 7.32 × 12 =
8. 8.12 × 15 =
9. 9.33 × 16 =
10. 10.21 × 14 =
11. 11.28 × 14 =
12. 12.14 × 12 =
13. 13.18 × 16 =
14. 14.17 × 24 =
15. 15.22 × 18 =
16. 16.32 × 14 =
17. 17.13 × 15 =
18. 18.49 × 16 =
19. 19.17 × 14 =
20. 20.31 × 24 =
21. 21.12 × 24 =
22. 22.33 × 18 =
23. 23.25 × 24 =
24. 24.35 × 16 =
25. 25.11 × 15 =
26. 26.40 × 24 =
27. 27.12 × 16 =
28. 28.12 × 12 =
29. 29.21 × 15 =
30. 30.45 × 15 =
31. 31.41 × 16 =
32. 32.37 × 14 =
33. 33.26 × 15 =
34. 34.49 × 14 =
35. 35.41 × 18 =
36. 36.23 × 12 =
37. 37.15 × 15 =
38. 38.20 × 14 =
39. 39.37 × 18 =
40. 40.14 × 16 =

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