1 and 3
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9/15 3*3=9 3*5=15 3 goes into both 9 and 15 evenly, so it's 3/5!
2 goes into 4. 3 goes into 6 or 9. 5 goes into 10, 15, 20, 25, 30. 7 goes into 14, 21, 28.
3. 6. 9. 10. 15. 30. 90.
1, 3, 5, 9, 15, 45.
It is: 15-9 = 6