Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 67 · 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 × 16 =
2. 2.27 × 15 =
3. 3.32 × 16 =
4. 4.21 × 18 =
5. 5.25 × 14 =
6. 6.37 × 15 =
7. 7.17 × 14 =
8. 8.32 × 14 =
9. 9.41 × 14 =
10. 10.27 × 14 =
11. 11.39 × 12 =
12. 12.41 × 12 =
13. 13.45 × 14 =
14. 14.15 × 24 =
15. 15.14 × 16 =
16. 16.30 × 12 =
17. 17.24 × 16 =
18. 18.16 × 16 =
19. 19.29 × 16 =
20. 20.29 × 12 =
21. 21.31 × 12 =
22. 22.14 × 24 =
23. 23.14 × 14 =
24. 24.17 × 16 =
25. 25.39 × 18 =
26. 26.11 × 16 =
27. 27.23 × 12 =
28. 28.33 × 14 =
29. 29.12 × 24 =
30. 30.23 × 24 =
31. 31.11 × 18 =
32. 32.49 × 18 =
33. 33.47 × 12 =
34. 34.20 × 16 =
35. 35.43 × 14 =
36. 36.36 × 12 =
37. 37.38 × 16 =
38. 38.17 × 12 =
39. 39.46 × 12 =
40. 40.13 × 18 =

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