Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 864 · 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. 1.30 × 12 =
2. 2.22 × 12 =
3. 3.41 × 24 =
4. 4.28 × 12 =
5. 5.28 × 14 =
6. 6.14 × 16 =
7. 7.30 × 14 =
8. 8.41 × 14 =
9. 9.31 × 14 =
10. 10.43 × 24 =
11. 11.12 × 16 =
12. 12.33 × 24 =
13. 13.28 × 18 =
14. 14.21 × 18 =
15. 15.47 × 14 =
16. 16.19 × 24 =
17. 17.22 × 15 =
18. 18.18 × 14 =
19. 19.20 × 14 =
20. 20.38 × 15 =
21. 21.25 × 24 =
22. 22.25 × 12 =
23. 23.39 × 24 =
24. 24.13 × 15 =
25. 25.48 × 18 =
26. 26.44 × 18 =
27. 27.12 × 12 =
28. 28.22 × 14 =
29. 29.44 × 24 =
30. 30.37 × 15 =
31. 31.20 × 15 =
32. 32.18 × 16 =
33. 33.45 × 24 =
34. 34.37 × 24 =
35. 35.38 × 14 =
36. 36.20 × 18 =
37. 37.26 × 18 =
38. 38.14 × 12 =
39. 39.49 × 12 =
40. 40.19 × 12 =

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