Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 240 · 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. 2.11 × 16 =
3. 3.40 × 16 =
4. 4.18 × 12 =
5. 5.37 × 18 =
6. 6.21 × 24 =
7. 7.38 × 14 =
8. 8.24 × 14 =
9. 9.12 × 12 =
10. 10.34 × 15 =
11. 11.42 × 24 =
12. 12.17 × 14 =
13. 13.29 × 12 =
14. 14.20 × 14 =
15. 15.45 × 16 =
16. 16.39 × 12 =
17. 17.16 × 24 =
18. 18.38 × 12 =
19. 19.48 × 24 =
20. 20.42 × 12 =
21. 21.15 × 14 =
22. 22.31 × 14 =
23. 23.42 × 16 =
24. 24.47 × 24 =
25. 25.38 × 16 =
26. 26.23 × 18 =
27. 27.30 × 24 =
28. 28.11 × 15 =
29. 29.47 × 16 =
30. 30.15 × 18 =
31. 31.47 × 14 =
32. 32.32 × 14 =
33. 33.30 × 12 =
34. 34.37 × 14 =
35. 35.45 × 12 =
36. 36.49 × 18 =
37. 37.34 × 16 =
38. 38.13 × 15 =
39. 39.46 × 12 =
40. 40.26 × 14 =

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