Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 894 · 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. 1.21 × 18 =
2. 2.29 × 18 =
3. 3.33 × 24 =
4. 4.29 × 12 =
5. 5.13 × 14 =
6. 6.15 × 16 =
7. 7.38 × 14 =
8. 8.31 × 18 =
9. 9.36 × 15 =
10. 10.40 × 24 =
11. 11.26 × 16 =
12. 12.44 × 24 =
13. 13.16 × 12 =
14. 14.13 × 16 =
15. 15.12 × 14 =
16. 16.44 × 18 =
17. 17.41 × 14 =
18. 18.21 × 24 =
19. 19.20 × 16 =
20. 20.25 × 15 =
21. 21.49 × 14 =
22. 22.39 × 14 =
23. 23.31 × 12 =
24. 24.32 × 18 =
25. 25.20 × 14 =
26. 26.39 × 18 =
27. 27.41 × 16 =
28. 28.43 × 12 =
29. 29.43 × 16 =
30. 30.11 × 16 =
31. 31.33 × 14 =
32. 32.48 × 16 =
33. 33.48 × 15 =
34. 34.11 × 12 =
35. 35.30 × 12 =
36. 36.31 × 16 =
37. 37.42 × 18 =
38. 38.41 × 24 =
39. 39.37 × 24 =
40. 40.23 × 14 =

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