We included HMH Into Math Grade 1 Answer Key PDF Module 6 Lesson 5 Represent Addend Unknown and Both Addends Unknown Problems with a Visual Model to make students experts in learning maths.

HMH Into Math Grade 1 Module 6 Lesson 5 Answer Key Represent Addend Unknown and Both Addends Unknown Problems with a Visual Model

I Can make a visual model to solve word problems when one or both addends are unknown.

Joey has 11 toy cars and buses. How many of each could he have?

Explanation:
Joey has 11 toy cars and buses
The two combinations of 11 are
6 + 5 = 11 and 9 + 2 = 11
They could have 6 cars and 5 buses or 9 cars and 2 buses.

Explain that children should toss a number cube to determine the number of cars Joey has and then use strategies to find the number of buses. Children repeat the activity to find a different combination of cars and buses that make a total of 11.

Build Understanding

There are 12 trees. 8 trees are apple trees and the rest are pear trees. How many pear trees are there?

A. The bar model shows the problem. How can you make a concrete model to match the bar model?

B. Use the bar model to help you write an equation that solves the problem.
Equation: ______
C. There are ____ pear trees.
The equation that solves the problem is
8 + 4 = 12
There are 4 pear trees.

Turn and Talk How would the bar model change if there were 7 apple trees instead of 8 apple trees?

Step It Out

1. There are 14 pens and pencils. 8 are pens. How many are pencils?

A. Use . Make a concrete model to match the bar model. Color to show what you did. Write the unknown addend.

B. Write a subtraction equation to match the problem.
Equation: ____
C. Write a subtraction equation to solve the problem.
Equation: ____
There are ___ pencils.

Explanation:
There are 14 pens and pencils
8 are pens
The subtraction equation that helps to solve the problem is
14 – 8 = 6
There are 6 pencils.

Turn and Talk How does the bar model help you understand the problem? Explain.

Step It Out

2. Bella sees 15 horses. All are brown or black. How many could be black and how many could be brown?

A. Show the problem. Use if you need to.
____ brown horses and ____ black horses
B. Complete the bar model. Then write an equation to prove your answer ¡s correct.

Equation: _____

Explanation:
Bella sees 15 horses
All are brown or black
The subtraction equation that helps to solve the problem is
15 – 10 = 5
The addition equation that matches with the problem is
10 + 5 = 15
There are 10 brown horses and 5 black horses.

Check Understanding Math Board

Use a bar model to solve.

Question 1.
Sam sees 13 cars. 7 are red and the rest are black. How many cars are black?

Equation: _________ ____ black cars

Explanation:
Sam sees 13 cars
7 are red cars and the rest are black
The subtraction equation that helps to solve the problem is
13 – 7 = 6
The addition equation that matches with the problem is
7 + 6 = 13
There are 6 black cars.

Use a bar model to solve.

Question 2.
Open Ended Josephine has 12 flowers. Some are yellow and some are red. How many yellow and red flowers could there be?

Equation: _________
___ yellow flowers ___ red flowers

Explanation:
Josephine has 12 flowers
Some are yellow and some are red
A combination of 12 is 7 and 5
7 + 5 = 12
Josephine has 7 yellow flowers and 5 red flowers.

Question 3.
Reason Harry has 14 toy airplanes. 9 are white and the rest are blue. How many airplanes are blue?

Equation: ____
___ blue airplanes

Explanation:
Harry has 14 toy airplanes
9 are white and the rest are blue
The subtraction equation that helps to solve the problem is
14 – 9 = 5
The addition equation that matches with the problem is
9 + 5 = 14
There are 5 blue airplanes.

Use a bar model to solve.

Question 4.
Carlo sees 13 ducks. 8 are in the pond and the rest are in the grass. How many ducks are in the grass?

Equation: ______ ____ducks

Explanation:
Carlo sees 13 ducks
8 are in the pond and the rest are in the grass
The subtraction equation that helps to solve the problem is
13 – 8 = 5
The addition equation that matches with the problem is
8 + 5 = 13 ducks.

Complete the bar model. Write an equation to match.

Question 5.

Equation: ______

Explanation:
The subtraction equation that helps to solve the problem is
16 – 7 = 16
The addition equation that matches with the problem is
7 + 9 = 16
The sum of 7 and 9 is 16.

Question 6.

Equation: ______

Explanation:
The subtraction equation that helps to solve the problem is
15 – 7 = 8
The addition equation that matches with the problem is
8 + 7 = 15
The sum of 8 and 7 is 15.

I’m in a Learning Mindset!

How does using a bar model help me understand solving problems with unknown addends?

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