All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 6 Two-Digit Addition and Subtraction will give you a clear idea of the concepts.

Essential Question

How can I add and subtract two-digit numbers?
First, add the numbers in the one’s place and write the carry in the tens place. Add the numbers in the tens place to make the sum.
I can subtract two-digit numbers by subtracting the numbers in one place. Next, I will subtract the numbers in the tens place.

Write how many tens and ones.

Question 1. ____________ tens ______________ ones = ______________
6 tens 4 ones = 64

Explanation:
There are 6 ten rods and 4 ones cubes
So, 6 tens and 4 ones is 64.

Question 2. ____________ tens ______________ ones = ______________
8 tens 6 ones = 86

Explanation:
There are 8 ten rods and 6 ones cubes
So, 8 tens and 6 ones is 86.

Question 3.
9 + 1 = _____________
10

Explanation:
The sum of 9 and 1 is 10
So, 9 + 1 = 10.

Question 4.
4 + 2 = _____________
6

Explanation:
The sum of 4 and 2 is 6
So, 4 + 2 = 6.

Subtract.

Question 5.
6 – 2 = _____________
4

Explanation:
The difference of 6 and 2 is 4
So, 6 – 2 = 4.

Question 6.
7 – 6 = ______________
1

Explanation:
The difference of 7 and 6 is 1
So, 7 – 6 = 1.

Question 7.
Maggie has 18 stickers. She gives 9 of them away. How many stickers does Maggie have left?
9 stickers

Explanation:
Maggie has 18 stickers
She gives 9 of them away
Subtract to find
18 – 9 =
Use doubles fact 9 + 9 = 18
So, 18 – 9 = 9
Therefore, Maggie have 9 stickers left with her.

My Math Words

Review Vocabulary
ones
subtract
tens

Find the sum or difference. Use the review words to complete each sentence.  Explanation:
I found the sum and difference and filled the blanks using the review words.

My Vocabulary Cards

Teacher Directions: Ideas for Use

• Ask students to use the blank cards to write their own vocabulary cords.
• Have students use blank cards to write basic addition and subtraction facts. Have students write the answer on the back of each card.

My Foldable    