Question

there were 135 buttons in a jar Robin put more bottom into the jar there were 175 buttons in the jar how many groups of 10 buttons did she put in the jar

Answer 1

I'm not sure if your asking how many total buttons there are in the jar or how many there were after she put 40 in so i'll answer both.

Total amount in groups of ten: 17 groups
Total amount Robin put in in groups of ten: 4 groups 

I hope that makes sense.