Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 661 · 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 × 12 =
2. 2.17 × 15 =
3. 3.28 × 12 =
4. 4.16 × 18 =
5. 5.29 × 24 =
6. 6.39 × 16 =
7. 7.15 × 24 =
8. 8.14 × 18 =
9. 9.42 × 16 =
10. 10.34 × 15 =
11. 11.39 × 15 =
12. 12.33 × 16 =
13. 13.32 × 12 =
14. 14.12 × 14 =
15. 15.34 × 12 =
16. 16.39 × 18 =
17. 17.20 × 15 =
18. 18.37 × 16 =
19. 19.41 × 14 =
20. 20.45 × 18 =
21. 21.32 × 14 =
22. 22.31 × 18 =
23. 23.20 × 14 =
24. 24.25 × 15 =
25. 25.11 × 12 =
26. 26.36 × 24 =
27. 27.46 × 24 =
28. 28.24 × 12 =
29. 29.37 × 24 =
30. 30.31 × 24 =
31. 31.15 × 14 =
32. 32.19 × 16 =
33. 33.28 × 18 =
34. 34.21 × 15 =
35. 35.20 × 24 =
36. 36.30 × 12 =
37. 37.36 × 12 =
38. 38.11 × 14 =
39. 39.41 × 24 =
40. 40.38 × 16 =

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