Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 942 · 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. 1.27 × 24 =
2. 2.37 × 24 =
3. 3.11 × 16 =
4. 4.28 × 24 =
5. 5.33 × 14 =
6. 6.15 × 24 =
7. 7.29 × 15 =
8. 8.25 × 16 =
9. 9.13 × 15 =
10. 10.30 × 12 =
11. 11.36 × 24 =
12. 12.29 × 16 =
13. 13.32 × 12 =
14. 14.15 × 16 =
15. 15.17 × 18 =
16. 16.27 × 18 =
17. 17.22 × 12 =
18. 18.13 × 12 =
19. 19.21 × 16 =
20. 20.13 × 14 =
21. 21.42 × 14 =
22. 22.30 × 15 =
23. 23.20 × 15 =
24. 24.12 × 18 =
25. 25.22 × 15 =
26. 26.17 × 14 =
27. 27.20 × 18 =
28. 28.41 × 15 =
29. 29.17 × 15 =
30. 30.11 × 24 =
31. 31.17 × 12 =
32. 32.47 × 18 =
33. 33.15 × 12 =
34. 34.44 × 14 =
35. 35.30 × 18 =
36. 36.37 × 16 =
37. 37.17 × 16 =
38. 38.21 × 12 =
39. 39.13 × 16 =
40. 40.49 × 24 =

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