Anna uses 1 eraser for every 2 packs of pencils she uses. If she uses 10 packs of pencils in a year, how many erasers will she use?
1 eraser for 2 packs
2 erasers for 4 packs
3 erasers for 6 packs
4 erasers for 8 packs
5 erasers for 10 packs
Do you see a pattern here?
You could have divided 10 by 2 to find the answer.