Lesson 20: Rounding — Practice Questions

1. 1. A school library has 836 books. To make an estimate, round this number to the nearest ten. The rounded number is ___.

2. 2. A video game costs 58.79 dollars. If you round this price to the nearest dollar, the estimated cost is ___ dollars.

3. 3. A baker says a recipe needs 'about 300 grams' of sugar instead of the exact '304 grams'. What is the best reason for doing this?

   • A. To make the measurement more precise.
   • B. Because rounded numbers are simpler to remember and communicate.
   • C. To use less sugar.
   • D. Because the scale is broken.

4. 4. In which of these situations would using a rounded number be LEAST appropriate?

   • A. Telling a friend the population of a city.
   • B. Estimating the time needed for a road trip.
   • C. Entering your Personal Identification Number (PIN) at an ATM.
   • D. Guessing the number of jellybeans in a large jar.

5. 5. A farmer harvested 623 apples. Round this amount to the nearest hundred. The rounded total is ___.

6. 6. A book costs $12.35$ dollars. If you round the price to the nearest dollar, what is the estimated cost? ___ dollars

7. 7. A movie ticket costs $24.50$ dollars. What is its price when rounded to the nearest dollar?

   • A. $24$ dollars
   • B. $25$ dollars
   • C. $24.50$ dollars
   • D. $20$ dollars

8. 8. A right triangle has legs with lengths of 5 cm and 12 cm. The length of the hypotenuse is ___ cm.

9. 9. A notebook costs $2.85, a pen costs $1.40, and an eraser costs $0.75. If you round each price to the nearest dollar, what is the estimated total cost? ___ dollars

10. 10. In a right triangle, which side is always the longest and is located opposite the 90-degree angle?

    • A. The leg
    • B. The vertex
    • C. The hypotenuse
    • D. The base