Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 935 · 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. 1.37 × 16 =
2. 2.40 × 12 =
3. 3.32 × 15 =
4. 4.33 × 18 =
5. 5.47 × 15 =
6. 6.49 × 24 =
7. 7.27 × 16 =
8. 8.35 × 12 =
9. 9.32 × 12 =
10. 10.47 × 18 =
11. 11.28 × 18 =
12. 12.45 × 24 =
13. 13.26 × 18 =
14. 14.31 × 14 =
15. 15.23 × 12 =
16. 16.35 × 24 =
17. 17.15 × 15 =
18. 18.47 × 12 =
19. 19.30 × 18 =
20. 20.36 × 14 =
21. 21.22 × 16 =
22. 22.18 × 24 =
23. 23.25 × 16 =
24. 24.45 × 16 =
25. 25.46 × 15 =
26. 26.30 × 14 =
27. 27.22 × 12 =
28. 28.23 × 24 =
29. 29.35 × 15 =
30. 30.24 × 18 =
31. 31.40 × 16 =
32. 32.21 × 24 =
33. 33.41 × 24 =
34. 34.17 × 14 =
35. 35.32 × 18 =
36. 36.20 × 24 =
37. 37.12 × 24 =
38. 38.24 × 24 =
39. 39.36 × 24 =
40. 40.16 × 18 =

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