Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 843 · 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. 1.12 × 15 =
2. 2.15 × 15 =
3. 3.24 × 15 =
4. 4.11 × 15 =
5. 5.16 × 24 =
6. 6.34 × 15 =
7. 7.31 × 14 =
8. 8.13 × 24 =
9. 9.47 × 12 =
10. 10.11 × 14 =
11. 11.11 × 16 =
12. 12.47 × 24 =
13. 13.23 × 12 =
14. 14.17 × 12 =
15. 15.31 × 12 =
16. 16.49 × 18 =
17. 17.44 × 15 =
18. 18.26 × 14 =
19. 19.44 × 24 =
20. 20.39 × 16 =
21. 21.45 × 12 =
22. 22.44 × 12 =
23. 23.29 × 12 =
24. 24.46 × 24 =
25. 25.12 × 12 =
26. 26.15 × 16 =
27. 27.49 × 14 =
28. 28.30 × 16 =
29. 29.13 × 12 =
30. 30.11 × 12 =
31. 31.41 × 16 =
32. 32.20 × 24 =
33. 33.38 × 14 =
34. 34.19 × 24 =
35. 35.33 × 18 =
36. 36.45 × 24 =
37. 37.34 × 18 =
38. 38.31 × 16 =
39. 39.43 × 12 =
40. 40.41 × 12 =

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