Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 411 · 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. 1.36 × 14 =
2. 2.18 × 16 =
3. 3.49 × 15 =
4. 4.42 × 14 =
5. 5.13 × 18 =
6. 6.37 × 15 =
7. 7.43 × 24 =
8. 8.37 × 12 =
9. 9.40 × 15 =
10. 10.48 × 15 =
11. 11.36 × 18 =
12. 12.29 × 15 =
13. 13.36 × 16 =
14. 14.22 × 18 =
15. 15.15 × 24 =
16. 16.39 × 24 =
17. 17.11 × 16 =
18. 18.11 × 12 =
19. 19.43 × 14 =
20. 20.13 × 16 =
21. 21.22 × 24 =
22. 22.15 × 15 =
23. 23.17 × 12 =
24. 24.28 × 14 =
25. 25.13 × 24 =
26. 26.37 × 16 =
27. 27.17 × 18 =
28. 28.14 × 18 =
29. 29.27 × 12 =
30. 30.38 × 15 =
31. 31.18 × 14 =
32. 32.15 × 16 =
33. 33.49 × 16 =
34. 34.49 × 14 =
35. 35.44 × 12 =
36. 36.15 × 18 =
37. 37.25 × 16 =
38. 38.28 × 16 =
39. 39.39 × 12 =
40. 40.47 × 18 =

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