# Lesson 18 Paint Splattered Bar Graph

Let’s solve problems involving a bar graph and addition and subtraction.

## Warm-up Number Talk: Subtract Within 1,000

Find the value of each expression mentally.

## Activity 1 Student Population

Oh no! Paint fell on the poster of the bar graph Clare and Priya created.

Answer the questions that you can with the graph. If a question cannot be answered, explain how you know.

What is the total number of students in grades 3 and 4?

How many more students are in grade 2 than in grade 1?

How many more students are in grade 3 than grade 2?

Write at least 2 mathematical questions that can be answered using the bar graph.

## Activity 2 Asked and Answered

For each round:

Trade one question you came up with in the last activity with a partner.

Answer the question. Show or explain your reasoning.

If you have time, trade another question with a different partner.

Round 1:

Round 2:

Round 3: