Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 716 · 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. 2.13 × 18 =
3. 3.42 × 15 =
4. 4.12 × 15 =
5. 5.22 × 14 =
6. 6.39 × 18 =
7. 7.20 × 15 =
8. 8.41 × 15 =
9. 9.32 × 12 =
10. 10.22 × 24 =
11. 11.24 × 15 =
12. 12.17 × 16 =
13. 13.38 × 14 =
14. 14.24 × 12 =
15. 15.46 × 12 =
16. 16.27 × 16 =
17. 17.19 × 15 =
18. 18.29 × 14 =
19. 19.23 × 15 =
20. 20.40 × 16 =
21. 21.46 × 15 =
22. 22.39 × 14 =
23. 23.34 × 24 =
24. 24.15 × 12 =
25. 25.23 × 16 =
26. 26.49 × 16 =
27. 27.45 × 16 =
28. 28.16 × 18 =
29. 29.26 × 14 =
30. 30.25 × 15 =
31. 31.45 × 18 =
32. 32.11 × 18 =
33. 33.23 × 24 =
34. 34.31 × 16 =
35. 35.22 × 12 =
36. 36.20 × 24 =
37. 37.27 × 14 =
38. 38.29 × 16 =
39. 39.18 × 16 =
40. 40.12 × 24 =

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