Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 865 · 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. 1.30 × 12 =
2. 2.43 × 16 =
3. 3.15 × 12 =
4. 4.38 × 12 =
5. 5.13 × 12 =
6. 6.42 × 16 =
7. 7.47 × 24 =
8. 8.33 × 18 =
9. 9.19 × 12 =
10. 10.34 × 12 =
11. 11.19 × 16 =
12. 12.16 × 18 =
13. 13.36 × 15 =
14. 14.44 × 14 =
15. 15.17 × 16 =
16. 16.49 × 24 =
17. 17.40 × 15 =
18. 18.15 × 24 =
19. 19.26 × 15 =
20. 20.22 × 18 =
21. 21.49 × 14 =
22. 22.24 × 15 =
23. 23.39 × 12 =
24. 24.38 × 24 =
25. 25.28 × 15 =
26. 26.23 × 24 =
27. 27.27 × 24 =
28. 28.41 × 24 =
29. 29.39 × 15 =
30. 30.17 × 12 =
31. 31.21 × 12 =
32. 32.32 × 18 =
33. 33.29 × 15 =
34. 34.14 × 24 =
35. 35.20 × 14 =
36. 36.12 × 12 =
37. 37.49 × 12 =
38. 38.25 × 12 =
39. 39.20 × 12 =
40. 40.28 × 12 =

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