Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 945 · 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. 1.39 × 14 =
2. 2.11 × 24 =
3. 3.29 × 24 =
4. 4.14 × 18 =
5. 5.35 × 24 =
6. 6.36 × 12 =
7. 7.37 × 24 =
8. 8.31 × 14 =
9. 9.13 × 12 =
10. 10.49 × 16 =
11. 11.16 × 14 =
12. 12.33 × 15 =
13. 13.27 × 18 =
14. 14.28 × 14 =
15. 15.21 × 16 =
16. 16.26 × 18 =
17. 17.38 × 12 =
18. 18.30 × 12 =
19. 19.23 × 24 =
20. 20.27 × 16 =
21. 21.42 × 12 =
22. 22.47 × 14 =
23. 23.46 × 18 =
24. 24.35 × 14 =
25. 25.16 × 12 =
26. 26.27 × 14 =
27. 27.46 × 16 =
28. 28.25 × 14 =
29. 29.14 × 12 =
30. 30.20 × 24 =
31. 31.42 × 16 =
32. 32.49 × 15 =
33. 33.47 × 16 =
34. 34.44 × 15 =
35. 35.44 × 14 =
36. 36.18 × 18 =
37. 37.33 × 24 =
38. 38.34 × 18 =
39. 39.20 × 18 =
40. 40.19 × 14 =

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