Refer to our Texas Go Math Grade 1 Answer Key Pdf to score good marks in the exams. Test yourself by practicing the problems from Texas Go Math Grade 1 Lesson 6.4 Answer Key Doubles Plus 1 and Doubles Minus 1.

## Texas Go Math Grade 1 Lesson 6.4 Answer Key Doubles Plus 1 and Doubles Minus 1

**Essential Question**

How can you use the doubles fact, 4 + 4, to solve each problem? Draw to show how Complete the addition sentence.

Explanation:

4 + 4 = 8

is a addition sentence

4 + 4 is a double fact

a number is added to itself is a double fact

**Explore**

How can you use the doubles fact, 4 + 4, to solve each problem? Draw to show how. Complete the addition sentence.

Explanation:

4 + 9

this is the example of double plus one

4 + 3 = 7

this is the example of double minus one

**For The Teacher**

- Read the problems. Look at the doubles fact. 4 + 4. Draw to show 1 more in the first workspace. Draw to show 1 less in the second workspace.

**Math Talk**

**Mathematical Processes**

Explain what happens to the doubles fact when you increase one addend by one or decrease one addend by one.

Explanation:

4 + 9

this is the example of double plus one

4 + 3 = 7

this is the example of double minus one

**Model and Draw**

Use the doubles fact 5 + 5 to add.

Answer:

Explanation:

5 + 6 = 11

double plus one 5 + 5 + 1 = 11

5 + 4 = 9

double minus one 5 + 5 – 1 = 9

**Share and Show**

**Use to add. Solve the doubles fact.**

Then use doubles plus one or doubles minus one. Circle + or — to show how you solved each one.

Question 1.

Answer:

Explanation:

use doubles plus one or doubles minus one

circle the appropriate symbol

2 + 2 = 4

2 + 2 + 1 = 5

2 + 2 – 1 = 3

Question 2.

Answer:

Explanation:

use doubles plus one or doubles minus one

circle the appropriate symbol

3 + 3 = 6

3 + 3 + 1 = 7

3 + 3 – 1 = 5

Question 3.

Answer:

Explanation:

use doubles plus one or doubles minus one

circle the appropriate symbol

4 + 4 = 8

4 + 4 + 1 = 9

4 + 4 – 1 = 7

**Problem Solving**

**Add. Write the doubles fact you used to solve the problem.**

Question 4.

Answer:

Explanation:

The number added to itself is called double fact

8 + 9 = 17

8 + 8 + 1 = 17

Question 5.

Answer:

Explanation:

The number added to itself is called double fact

2 + 3 = 5

2 + 2 + 1 = 5

Question 6.

Answer:

Explanation:

The number added to itself is called double fact

7 + 6 = 13

6 + 6 + 1 = 13

Question 7.

Answer:

Explanation:

The number added to itself is called double fact

6 + 5 = 11

5 + 5 + 1 = 11

Question 8.

Answer:

Explanation:

The number added to itself is called double fact

3 + 4 = 7

3 + 3 + 1 = 7

Question 9.

Answer:

Explanation:

The number added to itself is called double fact

4 + 5 = 9

4 + 4 + 1 = 9

**Write the addition sentence to solve.**

Question 10.

**H.O.T.** Brianna has 6 toy ducks. Ian has the same number of toy ducks and a toy fish. How many toys do Brianna and Ian have?

Answer:

Explanation:

Brianna has 6 toy ducks. Ian has the same number of toy ducks

6 + 6 = 12

and a toy fish.

12 + 1 = 13

6 + 6 + 1

6 + 7 = 13

13 toys that Brianna and Ian have

Question 11.

**H.O.T. Multi-Step** Add. Write the doubles plus one fact. Write the doubles minus one fact.

Answer:

Explanation:

use doubles plus one or doubles minus one

6 + 6 = 12

6 + 6 + 1 = 13

6 + 6 – 1 = 11

**Daily Assessment Task**

**Choose the correct answer.**

Question 12.

Alexis wins 3 games of checkers. Miranda wins 4 games. How many games did they play?

(A) 5

(B) 6

(C) 7

Answer: C

Explanation:

Alexis wins 3 games of checkers. Miranda wins 4 games.

3 + 3 + 1 = 7

7 games they play

Question 13.

**Analyze** Which doubles fact helps you solve the problem?

6 ducks swim on a pond. 7 more ducks join them. How many ducks are there now?

(A) 5 + 5 = 10

(B) 6 + 6 = 12

(C) 8 + 8 = 16

Answer: B

Explanation:

6 + 6 = 12

6 + 6 + 1 = 13

13 ducks are there now

Question 14.

Which doubles fact helps you solve the problem?

Mark buys 4 books.

Javier buys 5 books.

How many books do they buy?

(A) 2 + 2 = 4

(B) 3 + 3 = 6

(C) 5 + 5 = 10

Answer: C

Explanation:

Mark buys 4 books.

Javier buys 5 books.

4 + 4 + 1 = 9

9 books they buy

5 + 5 – 1 = 9

10 – 1 = 9

Question 15.

**Texas Test Prep** Which doubles fact helps you solve 6 + 7 = 13?

(A) 5 + 5 = 10

(B) 6 + 6 = 12

(C) 8 + 8 = 16

Answer: B

Explanation:

6 + 6 + 1 = 13

12 + 1 = 13

6 + 7 = 13

**Take Home Activity**

- Have your child explain how to use a doubles fact to solve the doubles plus one fact 4 + 5 and the doubles minus one fact 4 + 3.

Explanation:

4 + 4 = 8

4 + 4 + 1 = 9

4 + 4 – 1 = 7

### Texas Go Math Grade 1 Lesson 6.4 Homework and Practice Answer Key

**Solve the doubles fact. Then use doubles plus one or doubles minus one. Circle + or – to show how you solved each one.**

Question 1.

Answer:

Explanation:

use doubles plus one or doubles minus one

circle the appropriate symbol

6 + 6 = 12

6 + 6 + 1 = 13

6 + 6 – 1 = 11

Question 2.

Answer:

Explanation:

use doubles plus one or doubles minus one

circle the appropriate symbol

5 + 5 = 10

5 + 5 + 1 = 11

5 + 5 – 1 = 9

**Problem Solving**

**Write the addition sentence to solve.**

Question 3.

Mrs. Jones has 9 cans of soup. She has 8 cans of fruit. How many cans does Mrs. Jones have?

Answer:

Explanation:

Mrs. Jones has 9 cans of soup. She has 8 cans of fruit.

8 + 8 + 1 = 17

16 + 1 = 17

17 cans that Mrs. Jones have

**Texas Test Prep**

**Lesson Check**

**Choose the correct answer.**

Question 4.

There are 5 soccer balls. There are 4 basketballs. How many balls are there?

(A) 8

(B) 9

(C) 10

Answer:

Explanation: B

There are 5 soccer balls. There are 4 basketballs.

4 + 4 + 1 = 9

9 balls are there

Question 5.

Which doubles fact helps you solve the problem? 7 snakes sit in the sun. 8 more snakes join them. How many snakes are there now?

(A) 8 + 8 = 16

(B) 6 + 6 = 12

(C) 9 + 9 = 18

Answer: A

Explanation:

7 snakes sit in the sun. 8 more snakes join them.

7 + 7 + 1 = 15

8 + 8 – 1 = 15

16 – 1 = 15

15 snakes are there now

Question 6.

**Multi-Step** Keisha has 4 nickels. Chen has the same number of nickels and one dime. Which addition sentence shows how many coins Keisha and Chen have?

(A) 4 + 4 = 8

(B) 5 + 5 = 10

(C) 4 + 5 = 9

Answer: C

Explanation:

Keisha has 4 nickels. Chen has the same number of nickels and one dime.

4 + 4 + 1 = 9

4 + 5 = 9

is the addition sentence shows the coins Keisha and Chen have

Question 7.

Which doubles fact helps you solve 7 + 8 = 15?

(A) 7 + 7 = 14

(B) 9 + 9 = 18

(C) 6 + 6 = 12

Answer: A

Explanation:

7 + 7 + 1 = 15

The number added to itself is called double fact

double fact plus one.

14 + 1 = 15