All the solutions provided in McGraw Hill My Math Grade 2 Answer Key PDF Chapter 3 Add Two-Digit Numbers will give you a clear idea of the concepts.

Essential Question?
How can I add two-digit numbers?

Write each number two ways.

Question 1.
18 ones = _____
____ ten ____ ones
18 ones = 18
1 ten 8 ones
Explanation:
18 ones can also written as 1 tens and 8 ones

Question 2.
26 ones = _____
____ tens ____ ones
26 ones = 26
2 tens 6 ones
Explanation:
26 ones can also written as 2 tens and 6 ones

Question 3.  Explanation:
The sum of 2 and 7 is 9
2 + 7 = 9

Question 4.  Explanation:
The sum of 3 and 4 is 7
3 + 4 = 7

Question 5.  Explanation:
The sum of 2 and 2 is 4
2 + 2 = 4

Question 6.  Explanation:
The sum of 9 and 6 is 15
9 + 6 = 15

Question 7.
3 + 3 + 1 = ____
3 + 3 + 1 = 7
Explanation:
The sum of 3 and 3 is 6
6 and 1 is 7
3 + 3 = 6
6 + 1 = 7

Question 8.
4 + 2 + 3 = ____
4 + 2 + 3 = 9
Explanation:
The sum of 4 and 2 is 6
6 and 3 is 9
4 + 2 = 6
6 + 3= 9

Question 9.
Jack has 5 red marbles. Trent has 3 blue marbles. Lien has 2 green marbles. How many marbles do they have altogether?
______ marbles
10 marbles
Explanation:
Jack has 5 red marbles.
Trent has 3 blue marbles.
Lien has 2 green marbles.
5 + 3 + 2 = 10

My Math Words

Review Vocabulary

Use the review words to complete the graphic organizer. __________________________
__________________________
__________________________
__________________________
Explanation: 3 + 4 = 7
The sum of 3 and 4 is 7.

My Vocabulary Cards  Directions:
Ideas for Use

• Have students write a tally mark on the card each time they read the word in this chapter.
• Ask students to use the blank cards to write their own vocabulary cards.  My Foldable   