We included HMH Into Math Grade 1 Answer Key PDF Module 13 Lesson 4 Solve Two-Digit Addition and Subtraction Problems to make students experts in learning maths.
HMH Into Math Grade 1 Module 13 Lesson 4 Answer Key Solve Two-Digit Addition and Subtraction Problems
I Can choose strategies to solve two-digit addition and subtraction problems.
Step It Out
Question 1.
A farmer has 90 pumpkins. She sells 40 pumpkins. How many pumpkins are left?
A. Explain how to solve the problem.
Answer:
I will counting on to subtract
B. Draw and write to solve.
THINK: I can add to subtract.
4 tens + _________ tens = 9 tens
So, 9 tens – 4 tens = ___________ tens.
90 – 40 = __________
Answer:
I can add to subtract
I am at 4, I need 5 tens more to get 9 tens
4 tens + 5 tens = 9 tens
So, 9 tens – 4 tens = 5 tens
90 – 40 = 50.
C. There are _________ pumpkins left.
Answer:
There are 50 pumpkins left.
Question 2.
Laney has 64 red tulips. She gets 8 more tulips. How many tulips does she have?
A. Use a strategy to solve. Draw to show your work.
THINK: I can make a ten.
Answer:
I have the quick picture of the numbers 64 and 8
I can make ten
There are 4 and 8 that is 12 ones
12 ones is 1 ten 2 ones
So, 6 tens + 1 tens = 7 tens
64 + 8 = 7 tens 2 ones
B. Laney has _________ tulips.
Answer:
Laney has 72 tulips.
Turn and Talk What other strategies could you use to solve this problem? Explain.
Answer:
I can count on or count back to solve the problem.
Check Understanding
Solve. Draw to show your thinking.
Question 1.
There are 60 cows in a field. 50 cows go to the barn. How many cows are still in the field?
_________ cows
Answer:
Explanation:
There are 60 cows in a field
50 cows go to the barn
60 – 50 =
I drew 6 tens and took away 5 tens
1 ten is left
60 – 50 = 10
10 cows are still in the field.
On Your Own
Solve.
Question 2.
Mrs. Kelsie has 32 red apples and 21 green apples. How many apples does she have?
_________ apples
Answer:
53 apples
Explanation:
Mrs. Kelsie has 32 red apples and
21 green apples
32 + 21 =
32 = 3 tens 2 ones
21 = 2 tens 1 ones
32 + 21 = 5 tens 3 ones
So, Kelsie have 53 apples.
Question 3.
Reason Marco counts 80 pears. He counts 20 fewer peaches than pears. How many peaches does Marco count?
____________ peaches
Answer:
60 peaches
Explanation:
Marco counts 80 pears
He counts 20 fewer peaches than pears
80 – 20 =
Start at 80 count back by 10’s till 20
80 before, 70, 60
I reached at 60
80 – 20 = 60
So, Marco counts 60 peaches.
Question 4.
Construct Arguments Mr. Jones bikes 20 miles to his office. Describe how to find the number of miles he bikes to his office and home again. Solve the problem.
Answer:
Question 5.
Margo finds 57 orange leaves and 7 red leaves. How many leaves does she find?
__________ leaves
Answer:
64 leaves
Explanation:
Margo finds 57 orange leaves and 7 red leaves
57 + 7 =
Make ten:
7 ones + 7 ones = 1 ten 4 ones
5 ten + 1 ten and 4 ones
= 6 tens 4 ones
57 + 7 = 64
So, Margo finds 51 leaves.
Solve. Draw or write to explain.
Question 6.
Kathy sees 32 orange carrots and 5 purple carrots in the garden. How many carrots does she see?
_________ carrots
Answer:
Explanation:
Kathy sees 32 orange carrots and 5 purple carrots in the garden
Add 32 and 5
3 tens 2 ones + 5 ones
= 3 tens + (5+2) ones
= 3 tens 7 ones
32 + 5 = 37
So, Kathy have 37 carrots in all.
Question 7.
Reason Sam counts 50 potatoes. Jalen counts 30 potatoes. How many potatoes do Sam and Jalen count together?
_________ potatoes
Answer:
Explanation:
Sam counts 50 potatoes
Jalen counts 30 potatoes
50 + 30 =
Start at 50 count on by 10’s
Count more 3 times
50 after 60, 70 and 80
50 + 30 = 80
So, Sam and Jalen count 80 potatoes all together.
Question 8.
Construct Arguments Mr. Caleb has 30 brown eggs. He has 20 more brown eggs than white eggs. How many white eggs does Mr. Caleb have?
_________ white eggs
Does your answer make sense? Explain.
Answer:
Explanation:
Mr. Caleb has 30 brown eggs
He has 20 more brown eggs than white eggs
Number of white eggs = 30 + 20
3 tens + 2 tens = 5 tens
30 + 20 = 50
So, there are 50 white eggs.