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: