Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 446 · 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. 1.21 × 16 =
2. 2.32 × 18 =
3. 3.49 × 24 =
4. 4.21 × 24 =
5. 5.16 × 12 =
6. 6.12 × 18 =
7. 7.36 × 24 =
8. 8.27 × 12 =
9. 9.43 × 15 =
10. 10.11 × 15 =
11. 11.33 × 16 =
12. 12.29 × 15 =
13. 13.25 × 14 =
14. 14.41 × 24 =
15. 15.38 × 12 =
16. 16.37 × 12 =
17. 17.24 × 15 =
18. 18.35 × 12 =
19. 19.11 × 24 =
20. 20.29 × 14 =
21. 21.24 × 16 =
22. 22.23 × 14 =
23. 23.46 × 15 =
24. 24.38 × 14 =
25. 25.21 × 18 =
26. 26.29 × 12 =
27. 27.48 × 15 =
28. 28.30 × 24 =
29. 29.37 × 18 =
30. 30.31 × 15 =
31. 31.41 × 15 =
32. 32.48 × 12 =
33. 33.31 × 14 =
34. 34.42 × 15 =
35. 35.49 × 14 =
36. 36.46 × 16 =
37. 37.38 × 16 =
38. 38.37 × 24 =
39. 39.23 × 18 =
40. 40.13 × 12 =

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