Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 374 · 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. 2.49 × 16 =
3. 3.19 × 16 =
4. 4.25 × 24 =
5. 5.28 × 16 =
6. 6.31 × 14 =
7. 7.48 × 24 =
8. 8.30 × 18 =
9. 9.17 × 14 =
10. 10.48 × 14 =
11. 11.34 × 18 =
12. 12.30 × 12 =
13. 13.20 × 18 =
14. 14.22 × 24 =
15. 15.49 × 18 =
16. 16.12 × 24 =
17. 17.19 × 14 =
18. 18.42 × 18 =
19. 19.32 × 24 =
20. 20.49 × 24 =
21. 21.17 × 16 =
22. 22.14 × 12 =
23. 23.33 × 15 =
24. 24.46 × 12 =
25. 25.44 × 16 =
26. 26.25 × 14 =
27. 27.42 × 14 =
28. 28.18 × 12 =
29. 29.36 × 15 =
30. 30.47 × 14 =
31. 31.42 × 12 =
32. 32.30 × 14 =
33. 33.11 × 12 =
34. 34.27 × 18 =
35. 35.32 × 12 =
36. 36.31 × 12 =
37. 37.38 × 14 =
38. 38.14 × 24 =
39. 39.17 × 15 =
40. 40.24 × 12 =

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