Lesson 2 Story Problems and Equations

- Let’s solve story problems and write equations.

Warm-up Number Talk: Adding 1 More

Find the value of each expression mentally.

$5 + 1$
$5 + 2$
$6 + 2$
$7 + 3$

Activity 1 Write Equations

7 people were working on the computers.
3 more people came to the computers.
Now 10 people are working on the computers.
Equation:
A group of kids was using 10 puppets to act out a story.
They put 5 of the puppets away.
Now they have 5 puppets left.
Equation:
5 people came to story time.
Then 4 more people joined.
Now there are 9 people at story time.
Equation:
8 students were doing homework at a table.
3 of the students finished their homework and left the table.
Now there are 5 students at the table.
Equation:

Activity 2 Solve and Write Equations

There was a stack of 6 books on the table.
Someone put 4 more books in the stack.
How many books are in the stack now?
Show your thinking using drawings, numbers, or words.
Equation:
9 books were on a cart.
The librarian took 2 of the books and put them on the shelf.
How many books are still on the cart?
Show your thinking using drawings, numbers, or words.
Equation:
2 kids were working on an art project.
7 kids join them.
How many kids are working on the art project now?
Show your thinking using drawings, numbers, or words.
Equation:
The librarian had 8 bookmarks.
He gave 5 bookmarks to kids at the library.
How many bookmarks does he have now?
Show your thinking using drawings, numbers, or words.
Equation:

Practice Problem

Problem 1

There are 7 books on the shelf.
Mai takes 2 of the books off the shelf.
How many books are on the shelf now? Does this story match the equation $7 - 2 = 5$ or $7 + 2 = 9$ ?
Show your thinking using drawings, numbers, or words.

Equation: