Biruk wants to buy a book for $15.25 and a book for $4.85. He wants to pay with one $20.00 bill. Use estimation to decide whether this is reasonable or not. Explain what place value to round for an estimate this is useful in this situation.

Answer 1

This is reasonable because $15.25 rounds to $20.00, and $4.85 rounds to $5.00. Added up, that would equal $25.00, which is pretty close to $20.00.