Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 662 · 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. 1.27 × 14 =
2. 2.29 × 15 =
3. 3.35 × 12 =
4. 4.21 × 24 =
5. 5.49 × 24 =
6. 6.23 × 15 =
7. 7.46 × 24 =
8. 8.27 × 24 =
9. 9.14 × 16 =
10. 10.24 × 24 =
11. 11.20 × 12 =
12. 12.14 × 15 =
13. 13.33 × 16 =
14. 14.23 × 16 =
15. 15.45 × 12 =
16. 16.47 × 18 =
17. 17.18 × 24 =
18. 18.44 × 12 =
19. 19.39 × 18 =
20. 20.19 × 12 =
21. 21.17 × 24 =
22. 22.31 × 18 =
23. 23.49 × 14 =
24. 24.13 × 24 =
25. 25.21 × 18 =
26. 26.48 × 16 =
27. 27.28 × 16 =
28. 28.20 × 24 =
29. 29.38 × 24 =
30. 30.48 × 12 =
31. 31.41 × 16 =
32. 32.11 × 24 =
33. 33.22 × 12 =
34. 34.13 × 12 =
35. 35.14 × 12 =
36. 36.32 × 24 =
37. 37.29 × 18 =
38. 38.11 × 16 =
39. 39.18 × 12 =
40. 40.15 × 14 =

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