Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 15 · 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. 1.20 × 24 =
2. 2.45 × 12 =
3. 3.49 × 15 =
4. 4.15 × 14 =
5. 5.18 × 16 =
6. 6.38 × 18 =
7. 7.34 × 16 =
8. 8.38 × 14 =
9. 9.46 × 12 =
10. 10.16 × 12 =
11. 11.24 × 15 =
12. 12.46 × 18 =
13. 13.29 × 18 =
14. 14.41 × 24 =
15. 15.13 × 16 =
16. 16.17 × 12 =
17. 17.44 × 16 =
18. 18.20 × 12 =
19. 19.49 × 24 =
20. 20.37 × 24 =
21. 21.32 × 12 =
22. 22.43 × 16 =
23. 23.49 × 18 =
24. 24.23 × 18 =
25. 25.14 × 24 =
26. 26.19 × 18 =
27. 27.46 × 14 =
28. 28.26 × 12 =
29. 29.28 × 18 =
30. 30.17 × 24 =
31. 31.37 × 14 =
32. 32.16 × 24 =
33. 33.39 × 14 =
34. 34.34 × 24 =
35. 35.47 × 24 =
36. 36.18 × 24 =
37. 37.41 × 12 =
38. 38.29 × 24 =
39. 39.32 × 14 =
40. 40.31 × 24 =

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