Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 580 · 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. 1.22 × 18 =
2. 2.23 × 16 =
3. 3.27 × 18 =
4. 4.29 × 14 =
5. 5.48 × 12 =
6. 6.13 × 16 =
7. 7.48 × 14 =
8. 8.28 × 16 =
9. 9.38 × 18 =
10. 10.31 × 16 =
11. 11.42 × 24 =
12. 12.12 × 15 =
13. 13.12 × 18 =
14. 14.33 × 15 =
15. 15.45 × 15 =
16. 16.40 × 14 =
17. 17.11 × 12 =
18. 18.36 × 15 =
19. 19.49 × 14 =
20. 20.19 × 12 =
21. 21.40 × 24 =
22. 22.47 × 14 =
23. 23.44 × 16 =
24. 24.38 × 24 =
25. 25.41 × 15 =
26. 26.21 × 15 =
27. 27.15 × 16 =
28. 28.33 × 12 =
29. 29.46 × 14 =
30. 30.48 × 16 =
31. 31.22 × 24 =
32. 32.16 × 12 =
33. 33.45 × 14 =
34. 34.14 × 18 =
35. 35.39 × 18 =
36. 36.32 × 16 =
37. 37.41 × 12 =
38. 38.15 × 14 =
39. 39.32 × 18 =
40. 40.26 × 15 =

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