Unit 3 Contents

13. Nicholas used a calculator to solve 3590 411 and got 147,190. Without using a calculator or finding the exact answer, decide if his answer is reasonable. Explain how you decided.
14. Peter has $20.00 to spend on some special science books. The four books he chose cost $5.45, $3.35, $7.20, and $4.25. He rounded each price to the nearest dollar and decided he would have enough money to buy all four books. Do you agree with Peter? Explain why or why not.

Check-In: Questions 15–17

15. The students in Mr. Moreno's class want to take a field trip to a local science museum. They have $100.00 to spend. The cost of admission for each person is $3.20. There will be 32 people attending the trip. Jessie used rounding to decide if they had enough money for all 32 admissions.

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1. Is Jessie's estimate higher or lower than the actual cost for the admissions? Explain your reasoning.
2. Will Mr. Moreno's class have enough money for all of the admissions? How did you decide?
16. Nila and Irma found that last year 298 students attended the Family Science Night and 27 students presented projects. They wondered how many total views of the science projects the students could have seen. Without finding an exact answer, decide if 27 298 is greater or less than 10,000 views. Explain your thinking.
17. Romesh wants to make sure there is enough popcorn at the Family Science Night popcorn stand. Last year 119 families attended Science Night and each family purchased between 3 and 6 bags of popcorn. He expects about the same number of families will attend this year.
1. What is the lowest estimate for the number of bags of popcorn he will need? Explain how you estimated.
2. What is the highest estimate for the number of bags of popcorn he will need? Explain how you estimated.

Use the Frank's Weight in Gold pages in the Student Activity Book to continue to practice multiplying by multiples of ten.