All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 1 Lesson 3 Addition Number Sentences will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 1 Answer Key Chapter 1 Lesson 3 Addition Number Sentences
Explore and Explain
Teacher Directions: Use 
to model. There are 4 children playing tag. 2 more children join them. How many children are playing tag in all? Trace the cubes. Write the addition number sentence.
Explanation:
There are 4 children playing tag.
2 more children join them.
4 + 2 = 6
so, children in all.
See and Show
You can write an addition number sentence.
3 + 2 = 5 is an addition number sentences
Write an addition number sentence.
Question 1.
Answer:
2 + 2 = 4
Explanation:
The sum of 2 and 2 is 4
2 green balloons and 2 purple balloons
4 balloons in all.
Question 2.
Answer:
2 + 3 = 5
Explanation:
The sum of 2 and 3 is 5
2 yellow planes and 3 blue planes
so, 5 planes in all.
Question 3.
Answer:
3 + 5 = 8
Explanation:
The sum of 3 and 5 is 8
3 yellow balls and 5 blue balls
so, 8 balls in all.
Question 4.
Answer:
3 + 3 = 6
Explanation:
The sum of 3 and 3 is 6
3 blue cars and 3 green cars
so, 6 cars in all.
Talk Math What does the symbol + mean?
+ symbol means addition.
On My Own
Write an addition number sentence.
Question 5.
Answer:
1 + 2 = 3
Explanation:
The sum of 1 and 2 is 3
1 blue cap and 2 white caps
so, 3 caps in all.
Question 6.
Answer:
5 + 1 = 6
Explanation:
The sum of 5 and 1 is 6
5 white balls and 1 brown ball
so, 6 balls in all.
Question 7.
Answer:
3 + 6 = 9
Explanation:
The sum of 3 and 6 is 9
3 green cars and 6 red cars
so, 9 cars in all.
Question 8.
Answer:
3 + 3 = 6
Explanation:
The sum of 3 and 3 is 6
3 white horses and 3 brown horses
so, 6 horses in all.
Question 9.
Answer:
4 + 3 = 7
Explanation:
The sum of 4 and 3 is 7
4 dogs are there 3 dynos joined them
so, 7 animals in all.
Question 10.
Answer:
4 + 2 = 6
Explanation:
The sum of 4 and 2 is 6
There are 4 scoters 2 bicycles joined them
so, 6 vehicles in all.
Question 11.
Answer:
1 + 1 = 2
Explanation:
The sum of 1 and 1 is 2
1 black whistle and 1 red whistle
so, there are 2 whistles in all.
Question 12.
Answer:
3 + 2 = 5
Explanation:
The sum of 3 and 2 is 5
3 party bags and 2 party caps.
so, there are 5 party items in all.
Problem Solving
Question 13.
There are 2 dogs playing. 3 more dogs join them. How many dogs are playing in all?
Answer:
2 + 3 = 5 dogs
Explanation:
There are 2 dogs playing.
3 more dogs join them.
2 + 3 = 5
so, 5 dogs are playing in all
Question 14.
Suzy sees 2 bees flying around a flower. She sees 4 more bees on the flower. How many bees are there in all?
Answer:
4 + 2 = 6 bees.
Explanation:
Suzy sees 2 bees flying around a flower.
She sees 4 more bees on the flower.
4 + 2 = 6
6 bees are there in all
Write Math What does = mean?
_______________________
_______________________
_______________________
_______________________
Explanation:
‘=’ symbol represents equals to
6 = 6
3 + 3 = 2 + 4
McGraw Hill My Math Grade 1 Chapter 1 Lesson 3 My Homework Answer Key
Practice
Write an addition number sentence.
Question 1.
Answer:
3 + 5 = 8
Explanation:
The sum of 3 and 5 is 8
3 brown balls and 5 foot balls
so, 8 balls in all.
Question 2.
Answer:
2 + 2 = 4
Explanation:
The sum of 2 and 2 is 4
2 orange boots and 2 purple boots
so, there are 2 pairs of boots.
Question 3.
Answer:
6 + 1 = 7
Explanation:
The sum of 6 and 1 is 7
6 brown toys and 1 blue toy
so, 7 toys in all.
Question 4.
Answer:
1 + 4 = 5
Explanation:
The sum of 1 and 4 is 5
1 cat and 4 dogs
so, 5 animals in all.
Write an addition number sentence.
Question 5.
Answer:
3 + 2 = 5
Explanation:
The sum of 3 and 2 is 5
Question 6.
Answer:
1 + 3 = 4
Explanation:
The sum of 1 and 3 is 4
1 soccer and 3 cups.
Question 7.
There are 5 cats at the park. 2 more join them. How many cats are there in all?
____ 
____ ____ cats
Answer:
5 + 2 = 7
Explanation:
There are 5 cats at the park.
2 more join them.
5 + 2 = 7
7 cats are there in all
Question 8.
There are 4 squirrels on a tree. 2 more squirrels join them. How many squirrels are there in all?
____ ____ ____ squirrels
Answer:
4 + 2 = 6 squirrels
Explanation:
There are 4 squirrels on a tree.
2 more squirrels join them.
4 + 2 = 6
6 squirrels are there in all
Vocabulary Check
Draw lines to match.
Answer:
sum : is the answer to the addition problem
4 + 5 = 9 is the addition sentence.
Math at Home Create addition stories using cans of fruit or vegetables. Have your child write addition number sentences for the stories.