Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 591 · 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. 1.48 × 15 =
2. 2.18 × 16 =
3. 3.22 × 24 =
4. 4.46 × 24 =
5. 5.12 × 14 =
6. 6.29 × 12 =
7. 7.33 × 14 =
8. 8.49 × 24 =
9. 9.21 × 12 =
10. 10.12 × 12 =
11. 11.17 × 15 =
12. 12.18 × 12 =
13. 13.46 × 18 =
14. 14.14 × 16 =
15. 15.20 × 16 =
16. 16.23 × 16 =
17. 17.39 × 12 =
18. 18.34 × 15 =
19. 19.28 × 12 =
20. 20.18 × 24 =
21. 21.16 × 18 =
22. 22.39 × 14 =
23. 23.43 × 12 =
24. 24.33 × 15 =
25. 25.32 × 18 =
26. 26.47 × 14 =
27. 27.40 × 12 =
28. 28.26 × 14 =
29. 29.20 × 12 =
30. 30.39 × 24 =
31. 31.32 × 24 =
32. 32.37 × 18 =
33. 33.46 × 12 =
34. 34.19 × 14 =
35. 35.33 × 18 =
36. 36.20 × 15 =
37. 37.34 × 16 =
38. 38.13 × 16 =
39. 39.16 × 14 =
40. 40.38 × 14 =

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