Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 984 · 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. 1.12 × 14 =
2. 2.28 × 12 =
3. 3.36 × 15 =
4. 4.47 × 18 =
5. 5.19 × 18 =
6. 6.33 × 14 =
7. 7.21 × 24 =
8. 8.40 × 14 =
9. 9.15 × 12 =
10. 10.28 × 18 =
11. 11.47 × 12 =
12. 12.15 × 14 =
13. 13.30 × 14 =
14. 14.13 × 16 =
15. 15.23 × 24 =
16. 16.16 × 16 =
17. 17.49 × 14 =
18. 18.34 × 18 =
19. 19.34 × 16 =
20. 20.48 × 14 =
21. 21.19 × 15 =
22. 22.17 × 18 =
23. 23.16 × 14 =
24. 24.18 × 12 =
25. 25.34 × 12 =
26. 26.39 × 14 =
27. 27.25 × 12 =
28. 28.22 × 18 =
29. 29.24 × 12 =
30. 30.25 × 18 =
31. 31.31 × 18 =
32. 32.20 × 18 =
33. 33.49 × 12 =
34. 34.47 × 16 =
35. 35.19 × 14 =
36. 36.35 × 12 =
37. 37.47 × 14 =
38. 38.12 × 12 =
39. 39.27 × 18 =
40. 40.17 × 15 =

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