Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 699 · 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. 1.13 × 24 =
2. 2.30 × 24 =
3. 3.16 × 16 =
4. 4.37 × 14 =
5. 5.11 × 12 =
6. 6.48 × 15 =
7. 7.49 × 14 =
8. 8.37 × 18 =
9. 9.15 × 15 =
10. 10.20 × 12 =
11. 11.14 × 18 =
12. 12.36 × 14 =
13. 13.35 × 14 =
14. 14.16 × 15 =
15. 15.25 × 24 =
16. 16.42 × 12 =
17. 17.23 × 24 =
18. 18.42 × 14 =
19. 19.15 × 12 =
20. 20.19 × 14 =
21. 21.44 × 12 =
22. 22.12 × 12 =
23. 23.24 × 24 =
24. 24.24 × 16 =
25. 25.25 × 14 =
26. 26.43 × 15 =
27. 27.38 × 14 =
28. 28.38 × 18 =
29. 29.33 × 24 =
30. 30.23 × 16 =
31. 31.26 × 12 =
32. 32.35 × 18 =
33. 33.32 × 12 =
34. 34.41 × 12 =
35. 35.37 × 12 =
36. 36.17 × 15 =
37. 37.22 × 12 =
38. 38.27 × 18 =
39. 39.12 × 14 =
40. 40.39 × 16 =

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