We included **HMH Into Math Grade 1 Answer Key PDF** **Module 13 Lesson 1 Use a Hundred Chart to Show Two-Digit Addition and Subtraction **to make students experts in learning maths.

## HMH Into Math Grade 1 Module 13 Lesson 1 Answer Key Use a Hundred Chart to Show Two-Digit Addition and Subtraction

I Can use a hundred chart to add or subtract two-digit numbers.

**Spark Your Learning**

Use tools to add and subtract. Record your answers.

There are _________ birds.

Then _________ more birds come.

Now there are _________ birds in the tree.

Read the following aloud: There are 36 birds in a tree. More birds come. Now there are 56 birds in the tree. How many birds come to the tree? Have children choose tools to solve the problem.

Answer:

Explanation:

There are 36 birds in a tree

More birds come

Now there are 56 birds in the tree

Start at 36, count on by 10’s till 56

36 after 46, 56

I counted 2 more

2 tens is 20

So, 20 birds came to the tree.

**Build Understanding**

Question 1.

How can you use the hundred chart to solve these problems?

A. There are 30 frogs in a pond. Some frogs hop away. There are 10 frogs left. How many frogs hop away?

___________ frogs

Answer:

Explanation:

There are 30 frogs in a pond. Some frogs hop away

There are 10 frogs left

Start at 10, count by 10’s

Count on till 30

10 after 20, 30

I counted 2 more

2 tens is 20

So, 20 frogs hop away.

B. Haley sees 38 sheep in the barn. She sees more sheep in the field. She sees 78 sheep in all. How many sheep does she see in the field?

_________ sheep

Answer:

Explanation:

Haley sees 38 sheep in the barn

She sees more sheep in the field

She sees 78 sheep in all

Start at 38, count by 10’s

Count on till 78

38 after 48, 48, 68, 78

I counted 4 more

4 tens is 40

So, 40 sheep are in the field.

How did you use the hundred chart to solve the problem? Explain.

Answer:

I used hundreds chart to solve the problem. I counted on and back by 10’s to find the answer.

I can easily find the next and back tens in the hundreds chart.

**Turn and Talk** How can you use the hundred chart to subtract?

Answer:

I can use hundreds chart to subtract.

First mark the number from which i subtract then count back by 1’s or 10’s to subtract the number i need to subtract.

I will reach the answer that is the difference of the numbers.

**Step It Out**

Question 1.

There are 45 trees in a park. More trees are planted. Now there are 65 trees. How many trees are planted?

45 + _________ = 65

A. Start at the number 45.

Answer:

B. Use the hundred chart to add.

THINK: I can count on tens to get to 65.

Count on ___________ tens.

_________ tens = _________

Answer:

C. __________ more trees were planted.

Answer:

Start at the number 45

I can count on tens to get 65

Count on 2 tens

2 ten = 20

So, 20 more trees were planted.

**Check Understanding**

**Use the hundred chart to solve.**

Question 1.

There are 80 bees in a hive. Some bees fly away. There are 50 bees left. How many bees fly away?

__________ bees

Answer:

Explanation:

There are 80 bees in a hive

Some bees fly away

There are 50 bees left

Start at 50, count on by 10’s till 80

50 after 60, 70, 80

I counted 3 more times

3 tens is 30

So, 30 bees flew away.

**On Your Own**

**Use the hundred chart to solve.**

Question 2.

There are 24 flowers on a tree. More flowers bloom. Now there are 34 flowers. How many flowers bloom?

_________ flowers

Answer:

Explanation:

There are 24 flowers on a tree

More flowers bloom

Now there are 34 flowers

34 – 24 = 10

So, 10 more flowers bloom.

Question 3.

**Reason** There are 70 flowers on a tree. The wind blows 20 flowers off the tree. How many flowers are on the tree now? Explain your answer.

___________ flowers

Answer:

Explanation:

There are 70 flowers on a tree

The wind blows 20 flowers off the tree

Start at 70

Count back by 10’s

Count 2 times

70 before 60, 50

I am at 50 now

70 – 20 = 50

So, there are 50 flowers on the tree now.

Question 4.

33 + 30 = __________

Answer:

33 + 30 = 63

Explanation:

Start at 33

Count by 10’s

Count on 3 more

33 after 43, 53 and 63

I am at 63 now

So, 33 + 30 = 63.

Question 5.

80 – 70 = ___________

Answer:

80 – 70 = 10

Explanation:

Start at 80

Count by 10’s

Count back 7 times

80 before 70, 60, 50, 40, 30, 20, 10

I am at 10 now

So, 80 – 70 = 10.

Question 6.

60 – 50 = __________

Answer:

60 – 50 = 10

Explanation:

Start at 60

Count by 10’s

Count back 5 times

60 before 50, 40, 30, 20, 10

I am at 10 now

60 – 50 = 10.

Question 7.

17 + 40 = _____________

Answer:

17 + 40 = 57

Explanation:

Start at 17

Count by 10’s

Count on 4 more

17 after 27, 37, 47

I am at 57 now

17 + 40 = 57.

**I’m in a Learning Mindset!**

How did I feel about my learning when I solved Problem 2?

Answer: