What is 57.00 plus 31.00 plus 0.45?

• A. 87.45
• B. 88.00
• C. 88.45
• D. 89.45

Answer: (C)

Adding decimals means lining up the decimal points and adding each place value (tenths, hundredths). First combine the whole numbers: 57.00 plus 31.00 equals 88.00. Then add the remaining hundredths and tenths: 88.00 plus 0.45 equals 88.45. You can also think in cents: 5700 + 3100 + 45 equals 8845 cents, which is $88.45. So the total is 88.45.