We included **H****MH Into Math Grade 1 Answer Key**** PDF** **Module 7 Lesson 4 Represent Difference Unknown Problems with a Visual Model** to make students experts in learning maths.

## HMH Into Math Grade 1 Module 7 Lesson 4 Answer Key Represent Difference Unknown Problems with a Visual Model

I Can use visual models and write equations to solve word problems that compare to find an unknown difference.

**Spark Your Learning**

How can you show a way to solve 5 the problem?

Answer:

Explanation:

At the animal park, there are 12 seals and 5 lions

The subtraction equation that solves the problem is 12 – 5 = 7

So, there are 7 more seals than lions.

Read the problem. At the animal park, there are 12 seals and 5 lions. How many more seals are there than lions? Have children use tools to solve the problem.

**Build Understanding**

In the classroom, there are 6 children and 13 books. How many fewer children are there than books?

A. How can you draw to show the problem?

Answer:

B. Use the bar model to show another way.

C. Write an equation to solve.

____ fewer children

Answer:

Explanation:

In the classroom, there are 6 children and 13 books

The subtraction equation that solve the problem is 13 – 6 = 7

So, 7 fewer children are in the classroom.

**Turn and Talk** What helped you set up your bar model?

**Step It Out**

1. Ryan picks 8 roses. Lee picks 13 roses. How many more roses does Lee pick than Ryan?

A bar model can show the problem.

A. Write the name to label each bar.

B. Write the number of roses each person picks.

C. Write an addition and a subtraction equation to represent the problem.

Equation: ____

Equation: _____

Lee picks more ___ roses.

Answer:

Explanation:

Ryan picks 8 roses

Lee picks 13 roses

The subtraction equation that shows more number of roses Lee picks is

13 – 8 = 5

The addition equation to represent the problem is

8 + 5 = 13

Lee picks more 5 roses.

**Step It Out**

2. Tamara finds 5 pine cones. Marcy finds 11 pine cones. How many fewer pine cones does Tamara find than Marcy?

A. Write the name to label each bar.

B. Write the number of pine cones each person has.

C. Write an equation to represent the problem.

Equation: ____

Tamara finds ____ fewer pine cones.

Answer:

Explanation:

Tamara finds 5 pine cones

Marcy finds 11 pine cones

The equation that represent the problem is

11 – 5 = 6

Tamara finds 6 fewer pine cones than Marcy.

**Check Understanding Math Board**

**Complete the bar model. Write an equation.**

Question 1.

There are 16 red cubes. There are 9 blue cubes. How many blue fewer blue cubes are there than red cubes?

Equation: _____

There are ___ fewer blue cubes.

Answer:

Explanation:

There are 16 red cubes

There are 9 blue cubes

The subtraction equation that shows the fewer blue cubes is

16 – 9 = 7

So, there are 7 fewer blue cubes than red cubes.

**On Your Own**

**Complete the bar model. Write an equation.**

Question 2.

Sahil has 15 marbles. Theo has 6 marbles. How many more marbles does Sahil have than Theo?

Equation: ____

Sahil has ___ more marbles.

Answer:

Explanation:

Sahil has 15 marbles.

Theo has 6 marbles

The subtraction equation that shows the more number of marbles Sahil has is

15 – 6 = 9

So, Sahil has 9 more marbles than Theo.

Question 3.

There are 14 cows. There are 6 chickens. How many fewer chickens are there than cows?

Equation: ____

There are ____ fewer chickens.

Answer:

Explanation:

There are 14 cows

There are 6 chickens

The subtraction equation that shows the fewer chickens is

14 – 6 = 8

So, there are 8 fewer chickens.

Question 4.

**Reason** What two equations can you write to describe the bar model shown?

Equation: ____

Equation: ____

Answer:

The addition equation that describe the model is

5 + 7 = 12

The subtraction equation that describe the model is

12 – 5 = 7.

**On Your Own**

**Model with Mathematics Complete the bar model to solve. Write an equation.**

Question 5.

There are 15 red rubber bands. There are 8 blue rubber bands. How many fewer blue rubber bands are there than red?

Equation: ____

There are ___ fewer blue rubber bands.

Answer:

Explanation:

There are 15 red rubber bands

There are 8 blue rubber bands

The subtraction equation that shows fewer blue bands is

15 – 8 = 7

So, there are 7 fewer blue rubber bands.

Question 6.

Rose makes 17 drawings. Conne makes 9 drawings. How many more drawings does Rose make than Conne?

Equation: _____

Rose makes ___ more drawings.

Answer:

Explanation:

Rose makes 17 drawings

Conne makes 9 drawings

The subtraction equation that shows more number of drawings of rose is

17 – 9 = 6

Rose makes 6 more drawings.

**I’m in a Learning Mindset!**

Did using a visual model help me understand the problems?