## Envision Math 2nd Grade Textbook Answer Key Topic 1.6 Connecting Addition and Subtraction

**Connecting Addition and Subtraction**

Question 1.

____ + ____ = ____ ____ – ____ = ____ ____ – ____ = ____

Answer:

Question 2.

____ + ____ = ____ ____ – ____ = ____ ____ – ____ = ____

Answer:

Question 3.

____ + ____ = ____ ____ – ____ = ____ ____ – ____ = ____

Answer:

**Home Connection** Your child wrote one addition sentence and two subtraction sentences using the same

set of three numbers.

**Home Activity** Put 7 small objects, such as marbles or buttons, in two groups. Have your child tell you two

related subtraction facts and one addition fact for the numbers, for example: 7 – 2 = 5, 7 – 5 = 2, 2 + 5 = 7.

NS 2.1 Understand and use the inverse relationship between addition and subtraction (e.g., an opposite

number sentence for 8 + 6 = 14 is 14 – 6 = 8) to solve problems and check solutions. Also AF 1.2, AF 1.3.

**Guided Practice**

Write an addition sentence for the model.

Then write two related subtraction sentences for the model.

Question 1.

Answer:

Question 2.

__ + __ = ___

__ – __ = ___

__ – __ = ___

Answer:

Do you understand? How can you use an addition sentence to write related subtraction sentences?

**Independent Practice**

Write an addition sentence for the model.

Then write two related subtraction sentences for the model.

Question 3.

__ + __ = ___

__ – __ = ___

__ – __ = ___

Answer:

Question 4.

__ + __ = ___

__ – __ = ___

__ – __ = ___

Answer:

Reasoning Find a related addition fact.

Question 5.

12 – 5 = 7, 12 – 7 = 5,

Answer:

Question 6.

Yoshi has 6 red toys. He has 3 yellow toys.

Draw a model to show the whole and the parts.

Then, write three number sentences about the toys.

Answer:

Question 7.

Jan sees 10 ants on a rock. 4 ants walk off.

What number sentence shows the story?

Answer:

Question 8.

Journal Draw a model to show parts of a number

Use the model to write an addition sentence and two subtraction sentences.

__ + __ = ___

__ – __ = ___

__ – __ = ___

Answer: