Unit 2, Lesson 3

Add or Subtract to Solve Story Problems

Grade 2

Warm-up

How many do you see? How do you see them?

Some students sit on a bus. 34 more students get on the bus. Now there are 55 students. How many students were on the bus at first?

Solve each story problem. Show your thinking.

There are 65 students in the monkey house. 23 left to see the hippos. How many are still in the monkey house?
58 students want to see the bears. 27 students want to see the lions. How many more students want to see the bears than the lions?
Some birds are in cages outside of the bird house. 34 birds are inside the bird house. There are 88 birds. How many birds are outside?

We used addition and subtraction to find unknown values. We used different tools to show how to add and subtract 2-digit numbers.

We subtracted two 2-digit numbers by subtracting tens from tens and ones from ones.