Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 920 · 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. 1.42 × 16 =
2. 2.18 × 14 =
3. 3.13 × 16 =
4. 4.12 × 12 =
5. 5.17 × 14 =
6. 6.47 × 16 =
7. 7.29 × 15 =
8. 8.34 × 14 =
9. 9.42 × 24 =
10. 10.48 × 12 =
11. 11.15 × 24 =
12. 12.35 × 12 =
13. 13.34 × 16 =
14. 14.35 × 16 =
15. 15.40 × 16 =
16. 16.21 × 24 =
17. 17.19 × 24 =
18. 18.13 × 12 =
19. 19.37 × 14 =
20. 20.19 × 14 =
21. 21.36 × 12 =
22. 22.25 × 12 =
23. 23.32 × 14 =
24. 24.21 × 12 =
25. 25.39 × 18 =
26. 26.25 × 16 =
27. 27.23 × 16 =
28. 28.22 × 14 =
29. 29.42 × 18 =
30. 30.29 × 14 =
31. 31.40 × 12 =
32. 32.25 × 24 =
33. 33.48 × 14 =
34. 34.24 × 14 =
35. 35.23 × 14 =
36. 36.15 × 14 =
37. 37.12 × 16 =
38. 38.25 × 18 =
39. 39.23 × 24 =
40. 40.21 × 14 =

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