We included HMH Into Math Grade 1 Answer Key PDF Module 12 Lesson 2 Represent Subtracting Tens to make students experts in learning maths.
HMH Into Math Grade 1 Module 12 Lesson 2 Answer Key Represent Subtracting Tens
I Can subtract multiples of ten from multiples of ten.
Spark Your Learning
Start with some 10-cube trains. Hide some trains. Record below.
_________ tens started with
_________ tens left
__________tens hidden
_________ tens started with
_________ tens left
_________ tens hidden
Provide pairs with 10-cube trains (or tens blocks). Have one partner cover his or her eyes while the other partner hides a few of the cube trains. How many trains are left? How many trains were hidden? Have children write their answers, draw to show what they did, and then switch roles.
Answer:
Explanation:
6 tens started with
4 tens left
2 tens hidden
4 tens started with
3 tens left
1 ten hidden
Build Understanding
Question 1.
Lori collects 40 shells at the beach. She gives 10 shells to her sister. How many shells does Lori have now?
A. How can you show the problem?
_________ tens – __________ ten = ___________ tens
Answer:
4 tens – 1 ten = 3 tens
B. How can you write an equation to solve the problem?
Equation: ____________
Answer:
40 – 10 = 30
C. Lori has ___________ shells now.
Answer:
Lori has 30 shells now.
Explanation:
Lori collects 40 shells at the beach
She gives 10 shells to her sister
I drew tens to show the difference
4 tens – 1 ten = 3 tens
So, Lori has 30 shells now.
Turn and Talk How does knowing the number of tens help you write an equation to solve the problem?
Answer:
Question 2.
There are 50 children on the beach. Some children go home. Now there are 30 children on the beach. How many children go home?
A. Draw tens to show the problem.
Answer:
B. Write an equation for the problem.
Equation: __________ children go home.
Answer:
20 children went to home
Explanation:
There are 50 children on the beach
Some children go home
Now there are 30 children on the beach
5 tens – 3 tens = 20
So, 50 – 20 = 30
20 children went to home.
Check Understanding
Draw tens to show the problem. Solve.
Question 1.
There are 70 surfers in a surf contest. 40 of the surfers leave. How many surfers are left?
Equation: ___________
There are __________ surfers left.
Answer:
Explanation:
There are 70 surfers in a surf contest
40 of the surfers leave
I drew tens to show the difference
70 – 40 = 30
There are 30 surfers left.
Question 2.
__________ = 60 – 50
_________ ten = 6 tens – 5 tens
Answer:
Explanation:
I drew tens to show the difference
10 = 60 – 50
1 ten = 6 tens – 5 tens.
On Your Own
Draw tens to show your thinking. Write an equation to solve.
Question 3.
Model with Mathematics There are 80 seagulls at the beach. Some fly away. Now there are 50 seagulls. How many fly away?
80 – _________ = 50
Equation: ___________
_________ seagulls fly away.
Answer:
Explanation:
There are 80 seagulls at the beach. Some fly away
Now there are 50 seagulls
I drew to show the difference
80 – 50 = 30
So, 80 – 30 = 50
30 seagulls fly away.
Draw to solve.
Question 4.
30 – 30 = ___________
3 tens – 3 tens = _________ tens
Answer:
Explanation:
I drew tens to show the difference
30 – 30 = 0
3 tens – 3 tens = 0 tens
Question 5.
__________ = 90 – 40
__________ tens = 9 tens – 4 tens
Answer:
Explanation:
I drew tens to show the difference
50 = 90 – 40
5 tens = 9 tens – 4 tens.
I’m in a Learning Mindset!
When I was frustrated with showing my work, how did I show my feelings appropriately?
Answer: