Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 834 · 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. 1.31 × 24 =
2. 2.19 × 14 =
3. 3.13 × 14 =
4. 4.41 × 24 =
5. 5.31 × 12 =
6. 6.22 × 12 =
7. 7.36 × 14 =
8. 8.40 × 24 =
9. 9.36 × 12 =
10. 10.29 × 24 =
11. 11.23 × 16 =
12. 12.16 × 15 =
13. 13.47 × 15 =
14. 14.30 × 16 =
15. 15.19 × 24 =
16. 16.48 × 24 =
17. 17.17 × 16 =
18. 18.42 × 16 =
19. 19.13 × 24 =
20. 20.15 × 12 =
21. 21.40 × 14 =
22. 22.24 × 14 =
23. 23.26 × 16 =
24. 24.32 × 15 =
25. 25.44 × 18 =
26. 26.18 × 12 =
27. 27.13 × 15 =
28. 28.15 × 14 =
29. 29.36 × 16 =
30. 30.17 × 15 =
31. 31.35 × 14 =
32. 32.49 × 18 =
33. 33.49 × 12 =
34. 34.49 × 15 =
35. 35.21 × 16 =
36. 36.44 × 16 =
37. 37.11 × 14 =
38. 38.15 × 18 =
39. 39.11 × 15 =
40. 40.19 × 12 =

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