Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 899 · 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. 1.33 × 14 =
2. 2.29 × 16 =
3. 3.48 × 12 =
4. 4.37 × 16 =
5. 5.34 × 15 =
6. 6.11 × 12 =
7. 7.42 × 15 =
8. 8.27 × 16 =
9. 9.31 × 24 =
10. 10.36 × 18 =
11. 11.32 × 18 =
12. 12.46 × 15 =
13. 13.20 × 24 =
14. 14.14 × 18 =
15. 15.34 × 24 =
16. 16.22 × 15 =
17. 17.23 × 16 =
18. 18.21 × 15 =
19. 19.44 × 14 =
20. 20.24 × 24 =
21. 21.33 × 24 =
22. 22.28 × 14 =
23. 23.31 × 18 =
24. 24.37 × 12 =
25. 25.16 × 14 =
26. 26.11 × 15 =
27. 27.15 × 15 =
28. 28.37 × 24 =
29. 29.14 × 15 =
30. 30.20 × 12 =
31. 31.20 × 18 =
32. 32.47 × 18 =
33. 33.21 × 12 =
34. 34.41 × 12 =
35. 35.20 × 14 =
36. 36.49 × 14 =
37. 37.22 × 16 =
38. 38.28 × 12 =
39. 39.43 × 12 =
40. 40.12 × 14 =

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