LESSON 1 From the Fish Hatchery

Mrs. Dewey's class received fish eggs from the state fish hatchery. The students in Room 204 will check the temperature and the amount of acid in the water every day to make sure it is right for the fish eggs. When the fish hatch from the eggs, the students will watch the fish and take notes on what they see as the fish grow. After 5 weeks, the fish will be returned to the state fish hatchery where they will grow to become adult fish.

1. The hatchery gives 12 eggs for every student in the class. There are 27 students in Mrs. Dewey's class.
1. Estimate about how many eggs Mrs. Dewey's class should receive in all.
2. What was your strategy for estimating the total?
3. Luis said, “There has to be more than 270 eggs for sure! I know that much!” How did Luis make his estimate? Why does he say the total has to be more than 270?

4. Jackie estimated that there would be about 300 eggs total. Show or tell how you think Jackie made her estimate.
1. Show or tell how you find the exact total without paper and pencil or with just a few notes.
2. Is your exact answer close to your estimate? Is your exact answer reasonable?
3. Find an exact answer for 22 15 by using mental math or by writing just a few notes. Show or tell your strategy.

Mrs. Dewey saw that the fish eggs came in 13 containers with 25 eggs in each container. She said, “I don't think that is exactly 12 eggs for every student.”

4. Is Mrs. Dewey right? How many fish eggs did the class actually receive? What strategy did you use to figure it out?
5. What do you think happened when they were packing the fish eggs at the fish hatchery?

Counting Squares

Complete the Counting Squares pages in the Student Activity Book.