Unit 3, Lesson 26

What’s the Story?

Grade 1

Warm-up

Find the value of each expression mentally.

Show your thinking using drawings, numbers, or words.

Elena has 6 counters.
She gets some more.
Now she has 18 counters.
How many more counters did Elena get?
Elena has 18 counters.
She gets rid of some.
Now she has 6 counters.
How many counters did Elena get rid of?

Story Problem 1

Han has some pencils.
He gets 9 more.
Now he has 15 pencils.
How many pencils did Han have to start?

Story Problem 2

Han has 15 pencils.
He gives some to friends.
Now he has 9 pencils.
How many pencils did Han give to his friends?

Story Problem 3

Han has 9 pencils.
He gets some more from the store.
Now he has 15 pencils.
How many pencils did Han get from the store?

Story Problem 4

Han has 15 pencils.
He gives 9 to friends.
How many pencils does Han have now?

Show your thinking using drawings, words or numbers.

We used different methods to subtract within 20.

We used take away methods.

We used a ten to take away 8.

We used counting on methods.

8. . . 9, 10, 11, 12, 13, 14, 15

We used a ten to count on.