Real-World Examples of Rounding Decimals in Everyday Life

📚 Quick Study Guide

🔢 Rounding Basics: Rounding simplifies numbers to a desired level of precision. Look at the digit to the right of the place you are rounding to. 💰 Rounding Up: If the digit is 5 or greater, round up. For example, 3.7 rounds to 4. 📉 Rounding Down: If the digit is less than 5, round down. For example, 3.2 rounds to 3. 📍 Decimal Places: Rounding to the nearest tenth means one digit after the decimal, hundredth means two digits, and so on. 🛒 Real-World Use: Rounding is used in estimating costs, calculating approximate measurements, and simplifying complex figures.

🧪 Practice Quiz

1. What is 12.57 rounded to the nearest tenth?
   1. 12.50
   2. 12.6
   3. 12.5
   4. 13.0
2. You buy groceries that total $35.42. To the nearest dollar, how much did you spend?
   1. $35
   2. $36
   3. $35.50
   4. $35.40
3. A recipe calls for 2.75 cups of flour. If you want to round this to the nearest half cup, how much flour do you need?
   1. 2 cups
   2. 2.5 cups
   3. 3 cups
   4. 2.8 cups
4. What is 9.49 rounded to the nearest whole number?
   1. 9.5
   2. 10
   3. 9
   4. 9.0
5. The length of a table is 4.55 feet. What is this length rounded to the nearest tenth of a foot?
   1. 4.5 feet
   2. 4.6 feet
   3. 5 feet
   4. 4 feet
6. A store offers a 15.5% discount. If you want to estimate this to the nearest whole percent, what percentage would you use?
   1. 15%
   2. 16%
   3. 15.0%
   4. 15.6%
7. What is $ \pi $ (approximately 3.14159) rounded to two decimal places?
   1. 3.142
   2. 3.1
   3. 3.15
   4. 3.14