Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 101 · 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. 1.27 × 16 =
2. 2.43 × 12 =
3. 3.36 × 18 =
4. 4.49 × 16 =
5. 5.21 × 16 =
6. 6.49 × 14 =
7. 7.42 × 14 =
8. 8.21 × 18 =
9. 9.48 × 12 =
10. 10.26 × 15 =
11. 11.43 × 15 =
12. 12.34 × 15 =
13. 13.18 × 14 =
14. 14.35 × 14 =
15. 15.47 × 16 =
16. 16.41 × 24 =
17. 17.42 × 16 =
18. 18.39 × 12 =
19. 19.17 × 18 =
20. 20.11 × 15 =
21. 21.13 × 12 =
22. 22.41 × 12 =
23. 23.41 × 15 =
24. 24.23 × 16 =
25. 25.24 × 14 =
26. 26.13 × 24 =
27. 27.18 × 15 =
28. 28.26 × 16 =
29. 29.16 × 14 =
30. 30.46 × 12 =
31. 31.40 × 18 =
32. 32.40 × 14 =
33. 33.47 × 18 =
34. 34.23 × 14 =
35. 35.43 × 24 =
36. 36.16 × 15 =
37. 37.12 × 16 =
38. 38.19 × 16 =
39. 39.32 × 12 =
40. 40.19 × 24 =

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