Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 332 · 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 × 12 =
2. 2.40 × 14 =
3. 3.37 × 14 =
4. 4.16 × 16 =
5. 5.18 × 15 =
6. 6.44 × 18 =
7. 7.43 × 14 =
8. 8.48 × 12 =
9. 9.40 × 18 =
10. 10.46 × 12 =
11. 11.20 × 14 =
12. 12.13 × 15 =
13. 13.32 × 14 =
14. 14.22 × 18 =
15. 15.47 × 16 =
16. 16.32 × 15 =
17. 17.17 × 24 =
18. 18.28 × 18 =
19. 19.13 × 14 =
20. 20.30 × 24 =
21. 21.45 × 12 =
22. 22.32 × 16 =
23. 23.19 × 18 =
24. 24.49 × 24 =
25. 25.25 × 14 =
26. 26.39 × 14 =
27. 27.30 × 18 =
28. 28.42 × 18 =
29. 29.32 × 24 =
30. 30.47 × 14 =
31. 31.14 × 14 =
32. 32.23 × 24 =
33. 33.27 × 14 =
34. 34.33 × 14 =
35. 35.48 × 16 =
36. 36.41 × 15 =
37. 37.40 × 15 =
38. 38.18 × 16 =
39. 39.19 × 15 =
40. 40.46 × 16 =

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