## Math Expressions Common Core Grade 2 Unit 1 Lesson 8 Answer Key Equations, Equation Chains, and Vertical Form

**Math Expressions Grade 2 Unit 1 Lesson 8 Homework**

**Find the total or partner.**

Question 1.

Answer:

Explanation:

Addition can be defined as an arithmetic operation in which the sum or total of two or more numbers is determined.

The sum of two numbers is just putting the partners or addends together.

5 + 6 = 11

9 + 8 = 17

8 + 3 = 11

9 + 4 = 13

6 + 6 = 12

8 + 6 = 14

Question 2.

Answer:

Explanation:

To find the difference between two partners, subtract the number with the smallest value from the number with the largest value.

The product of this sum is the difference between the two numbers.

11- 9 = 2

14 – 6 = 8

11 – 4 = 7

13 – 5 = 8

12 – 3 = 9

16 – 9 = 7

Question 3.

Answer:

Explanation:

To find the difference between two numbers, subtract the number with the smallest value from the number with the largest value.

The product of this sum is the difference between the two numbers.

16 – 8 = 8

15 – 7 = 8

12 – 5 = 7

11 – 2 = 9

17 – 9 = 8

14 – 7 = 7

Question 4.

Draw a Math Mountain to solve.

16 – 7 = _________

Answer:

16 – 7 = 9

Explanation:

Explanation:

In the Math mountain, the top part of the mountain to called Total or Sum and it consists of two parts called Partners or Addends

The addition of two whole numbers results in the total amount or sum of those values combined.

Subtraction is opposite of addition.

**Math Expressions Grade 2 Unit 1 Lesson 8 Remembering**

**Add.**

Question 1.

Answer:

Explanation:

Addition can be defined as an arithmetic operation in which the sum or total of two or more numbers is determined.

The sum of two numbers is just putting the partners or addends together.

4 + 9 = 13

8 + 8 =16

9 + 8 = 17

7 + 2 = 9

8 + 9 =17

5 + 9 = 14

**Subtract. **

Question 2.

Answer:

Explanation:

To find the difference between two numbers, subtract the number with the smallest value from the number with the largest value.

The product of this sum is the difference between the two numbers.

15 – 8 = 7

11 – 3 = 8

16 – 7 = 9

9 – 6 = 3

14 – 8 = 6

8 – 8 = 0

Question 3.

Draw a Moth Mountain and write one more equation.

5 + 6 = _______

9 + 7 = _______

8 + 4 = _______

Answer:

6 + 5 = 11

7 + 9 = 16

4 + 8 =12

Explanation:

In the Math mountain, the top part of the mountain to called Total or Sum and it consists of two parts called Partners or Addends

The addition of two whole numbers results in the total amount or sum of those values combined.

**Complete the addition doubles equation.**

Question 4.

_______ + _______ = 18

Answer:

9 + 9 = 18

Explanation:

There are only two numbers 9 and 18

the doubles of 9 is 18

Question 5.

_______ + _______ 12

Answer:

6 + 6 = 12

Explanation:

there are only two numbers 6 and 12

the doubles of 6 is 12

Question 6.

**Stretch Your Thinking** Suppose you cannot remember the answer to 15 – 8 = _______. What could you do to solve?

Answer:

15 – 8 = 7

Explanation:

In the Math mountain, the top part of the mountain to called Total or Sum and it consists of two parts called Partners or Addends

The addition of two whole numbers results in the total amount or sum of those values combined.

Subtraction is opposite of addition.