All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 6 Lesson 1 Add Tens will give you a clear idea of the concepts.

Explore and Explain

3 tens + 2 tens = _____________ tens
30 + 20 = ______________ Explanation:
3 tens + 2 tens = 7 tens
30 + 20 = 70.

Teacher Directions: Use to model. There are 35 people at a baseball game. 3 more people come to the game. How many people are at the game in all? Draw the rods and units that you used. Explain to a classmate how you found the answer. Explanation:
There are 35 people at a baseball game
3 more people come to the game
3 tens = 30
5 ones + 3 ones = 8 ones
So, 35 + 3 = 38.

See and Show

Find 20 + 20 by adding the tens.
To find 20 + 20, add 2 tens + 2 tens which equals 4 tens or 40. Add. Use to help.

Question 1.
4 tens + 2 tens = ____________ tens
40 + 20 = ____________ Explanation:
4 tens + 2 tens = 60 tens
40 + 20 = 60.

Question 2.
6 tens + 1 ten = ____________ tens
60 + 10 = ____________ Explanation:
6 tens + 1 tens = 7 tens
60 + 10 = 7

Question 3.
5 tens + 2 tens = ____________ tens
50 + 20 = ____________ Explanation:
5 tens + 2 tens = 7 tens
50 + 20 = 70.

Question 4.
7 tens + 2 tens = ____________ tens
70 + 20 = ____________ Explanation:
7 tens + 2 tens = 9 tens
70 + 20 = 90.

Question 5.
8 tens + 1 ten = ____________ tens
80 + 10 = ____________ 