Stamps cost 37 cents each. Helen has $2.60 in cash. What is the greatest number of stamps she can buy?

The answer is seven.

$0.37 times 2 equals $0.74

$0.37 times 3 equals $1.11

$0.37 times 4 equals $1.48

$0.37 times 5 equals $1.85

$0.37 times 6 equals $2.22

$0.37 times 8 equals $2.29

six is too little, nine is too much.

$0.37 times 7 equals $2.59

Helen can buy 7 stamps