Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 992 · 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. 1.26 × 14 =
2. 2.31 × 24 =
3. 3.18 × 16 =
4. 4.46 × 16 =
5. 5.11 × 14 =
6. 6.49 × 12 =
7. 7.26 × 24 =
8. 8.29 × 12 =
9. 9.12 × 14 =
10. 10.12 × 18 =
11. 11.37 × 14 =
12. 12.30 × 15 =
13. 13.22 × 16 =
14. 14.21 × 24 =
15. 15.33 × 24 =
16. 16.20 × 24 =
17. 17.46 × 24 =
18. 18.30 × 18 =
19. 19.34 × 14 =
20. 20.22 × 15 =
21. 21.41 × 16 =
22. 22.34 × 16 =
23. 23.36 × 15 =
24. 24.19 × 16 =
25. 25.48 × 15 =
26. 26.32 × 18 =
27. 27.14 × 12 =
28. 28.17 × 15 =
29. 29.21 × 12 =
30. 30.49 × 14 =
31. 31.17 × 16 =
32. 32.47 × 16 =
33. 33.12 × 15 =
34. 34.35 × 24 =
35. 35.18 × 24 =
36. 36.14 × 15 =
37. 37.21 × 18 =
38. 38.29 × 24 =
39. 39.42 × 14 =
40. 40.27 × 24 =

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