Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 409 · 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. 1.18 × 12 =
2. 2.40 × 15 =
3. 3.47 × 18 =
4. 4.30 × 24 =
5. 5.17 × 15 =
6. 6.36 × 14 =
7. 7.43 × 16 =
8. 8.13 × 12 =
9. 9.46 × 12 =
10. 10.39 × 16 =
11. 11.16 × 14 =
12. 12.39 × 12 =
13. 13.33 × 12 =
14. 14.34 × 15 =
15. 15.27 × 15 =
16. 16.15 × 18 =
17. 17.14 × 18 =
18. 18.22 × 16 =
19. 19.37 × 12 =
20. 20.49 × 16 =
21. 21.15 × 16 =
22. 22.25 × 12 =
23. 23.42 × 24 =
24. 24.31 × 16 =
25. 25.46 × 24 =
26. 26.25 × 14 =
27. 27.26 × 15 =
28. 28.22 × 15 =
29. 29.34 × 24 =
30. 30.27 × 14 =
31. 31.48 × 14 =
32. 32.30 × 16 =
33. 33.17 × 12 =
34. 34.44 × 15 =
35. 35.43 × 15 =
36. 36.28 × 18 =
37. 37.25 × 16 =
38. 38.46 × 14 =
39. 39.12 × 16 =
40. 40.17 × 16 =

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