We included HMH Into Math Grade 1 Answer Key PDF Module 12 Lesson 1 Represent Adding Tens to make students experts in learning maths.

I Can add multiples of ten with multiples of ten. First Time
2 tens + _______ tens = _________ tens

Second Time
2 tens + _______ tens = _________ tens
Tell children they will start with 2 tens and then add some more tens. Children toss the number cube and add that many tens. Children should draw to show the addition. Have pairs repeat the activity. First time:
2 tens + 3 tens = 5 tens
Second time:
2 tens + 4 tens = 6 tens.

Build Understanding

Question 1.
The Beach Shop has 30 adult sunglasses and 40 child sunglasses. How many sunglasses does the shop have? A. How can you show the problem?
________ tens + _________ tens = _________ tens 3 tens + 4 tens = 7 tens

B. How can you write an equation to solve the problem?
Equation: ____________
3 + 4 = 7 is the equation that solve the problem.

Connect to Vocabulary
equations:
80 – 50 = 30
9 = 6 + 3
90 = 60 + 30

C. The shop has _________ sunglasses.
The shop has 70 sunglasses.

Explanation:
The Beach Shop has 30 adult sunglasses and 40 child sunglasses
30 is 3 tens, 40 is 4 tens
So, 30 + 40 =
3 tens + 4 tens = 7 tens
There are 70 sun glasses in the shop.

Turn and Talk Does your answer make sense? How do you know?

Question 2.
A store has 30 large rafts and 50 small rafts. How many rafts does the store have? A. Use tens to show the problem. 3 tens + 5 tens = 8 tens

B. Write an equation to solve the problem.
Equation: __________
3 + 5 = 8 is the equation that solves the problem.

C. The store has __________ rafts.
The store has 80 rafts.

Explanation:
A store has 30 large rafts and 50 small rafts
30 is 3 tens
50 is 5 tens
3 tens + 5 tens = 8 tens
So, 30 + 50 = 80
The store has 80 rafts in all.

Check Understanding

Draw tens to show the problem. Write an equation to solve.

Question 1.
Kara has 20 blue marbles. She has 40 purple marbles. How many marbles does Kara have?
Equation: ___________
Kara has __________ marbles. Explanation:
Kara has 20 blue marbles
She has 40 purple marbles
20 + 40 =
2 tens + 4 tens = 6 tens
So, 20 + 40 = 60
Kara has 60 marbles.

Draw tens to show the problem. Write an equation to solve.

Question 2.
Model with Mathematics Marcus has 20 oranges. Sally has 10 oranges. How many oranges do they have? Equation: _____________
They have ___________ oranges. Explanation:
Marcus has 20 oranges
Sally has 10 oranges
20 is 2 tens
10 is 1 tens
2 tens + 1 ten = 3 tens
20 + 10 = 30
So, they have 30 oranges

Question 3.
Open-Ended Jodi has 5 packages of 10 pens each. All the pens in each package are either yellow or blue. How many of each could she have?
Equation: __________
20 + 30 = 50

Explanation:
Jodi has 5 packages of 10 pens each
All the pens in each package are either yellow or blue

Question 4.
Reason Explain how to show this equation using .
20 + 20 = 40 