Sophia has $20. She buys a new hair band for $3.99, gum for $2.29, and a brush for$6.75. Not including tax, estimate how much change she should receive. Shoe your work

It says to estimate, so if I'm right, you would round each, add the new totals together, and then subtract that total from 20. 3.99 would be 4 dollars, 2.29 would round down to 2 dollars, and 6.75 rounds up to 7. 4+2+7=13. 20-13=7, so therefore, she would recieve about 7 dollars in change.