Unit 3 Contents

Choose convenient numbers to help you make quick estimates for Questions 1–11. Do not use a calculator.

Planetarium Field Trip

1. Mr. Moreno's class is taking a field trip to the planetarium. The cost of admission is $4.35 per student. If 26 students attend, about how much money is needed for admission? Explain how you estimated.
2. The planetarium is celebrating its 9th anniversary. The planetarium is open 357 days a year. About how many days has the planetarium been open?
3. Between 2165 and 2698 people visit the planetarium every day. About how many people visit the planetarium every year? Give your answer as a range between two numbers.
4. Estimate the products. Show the convenient numbers you chose.
1. 229,476 27 = __________
2. 1,029,576,123 4329 = __________
3. 11,111 1111 = __________
4. 343,217 999 = __________

Estimation with Big Numbers

5. Ming says there are about 2,000,000 seconds in a week. Jackie says it is more like 600,000. Jacob says there are about 10,000 seconds. Whose estimate is the most reasonable? Show or tell how you know.
6. Find two numbers whose product lies between 120,000 and 130,000.
7. Find a number to multiply by 322 that will give a product between 6000 and 7000. Show or tell how you know.
8. It costs $11,234 per year to educate one student at Glen Oaks High School. There are 2743 students currently enrolled. About how much does it cost a year to educate all the high school students?