All the solutions provided in McGraw Hill My Math Grade 1 Answer Key PDF Chapter 3 Lesson 1 Count On 1, 2, or 3 will give you a clear idea of the concepts.
McGraw-Hill My Math Grade 1 Answer Key Chapter 3 Lesson 1 Count On 1, 2, or 3
Explore and Explain
Answer:
Explanation:
I drew a group of 4 crayons
Then, I drew 2 more crayons
The addition number sentence that tells how many in all is 4 + 2 = 6.
Teacher Directions: Draw a group of four crayons. Then draw 1, 2, or 3 more crayons. Write an addition number sentence that tells how many in all.
See and Show
You can count on to add. There are 5 crayons in the group. Add 2 more crayons.
Helpful Hint
Start with the greater number, 5. Count on 2 more. 5, 6, 7
5 + 2 = 7
Use Start with the greater number. Count on to add.
Question 1.
Answer:
Explanation:
Started with the greater number, 7
I Counted on 3 more. 8, 9, 10
So, 7 + 3 = 10.
Question 2.
Answer:
Explanation:
Started with the greater number, 6
I Counted on 2 more. 7, 8
So, 7 + 2 = 8.
Talk Math Tell how to count on to add 5 + 3.
Answer:
Start at 5
Count by 1’s
Count on 3 more
5 after 6, 7, 8
So, 5 + 3 = 8.
On My Own
Start with the greater number. Count on to add.
Question 3.
5 + 3 = _____
Answer:
8
Explanation:
Started with the greater number, 8
I Counted on 3 more. 6, 7, 8
So, 5 + 3 = 8.
Question 4.
8 + 3 = _____
Answer:
11
Explanation:
Started with the greater number, 8
I Counted on 3 more. 9, 10, 11
So, 8 + 3 = 11.
Question 5.
4 + 1 = ____
Answer:
5
Explanation:
Started with the greater number, 4
I Counted on 1 more. 5
So, 4 + 1 = 5.
Question 6.
1 + 2 = _____
Answer:
3
Explanation:
Started with the greater number, 2
I Counted on 1 more. 3
So, 1 + 2 = 3.
Question 7.
9 + 3 = ____
Answer:
12
Explanation:
Started with the greater number, 9
I Counted on 3 more. 10, 11, 12
So, 9 + 3 = 12.
Question 8.
1 + 8 = ____
Answer:
9
Explanation:
Started with the greater number, 8
I Counted on 1 more. 9
So, 1 + 8 = 9.
Question 9.
3 + 7 = ____
Answer:
10
Explanation:
Started with the greater number, 7
I Counted on 3 more. 8, 9, 10
So, 3 + 7 = 10.
Question 10.
2 + 9 = ____
Answer:
11
Explanation:
Started with the greater number, 9
I Counted on 2 more. 10, 11
So, 2 + 9 = 11.
Question 11.
1 + 7 = ____
Answer:
8
Explanation:
Started with the greater number, 7
I Counted on 1 more. 8
So, 1 + 7 = 8.
Question 12.
4 + 3 = ____
Answer:
7
Explanation:
Started with the greater number, 4
I Counted on 3 more. 5, 6, 7
So, 4 + 3 = 7.
Question 13.
2 + 7 = ___
Answer:
9
Explanation:
Started with the greater number, 7
I Counted on 2 more. 8, 9
So, 2 + 7 = 9.
Question 14.
5 + 1 = ___
Answer:
6
Explanation:
Started with the greater number, 5
I Counted on 1 more. 6
So, 5 + 1 = 6.
Question 15.
Answer:
Explanation:
Started with the greater number, 8
I Counted on 2 more. 9, 10
So, 8 + 2 = 10.
Question 16.
Answer:
Explanation:
Started with the greater number, 6
I Counted on 1 more. 7
So, 1 + 6 = 7.
Question 17.
Answer:
Explanation:
Started with the greater number, 9
I Counted on 1 more. 10
So, 9 + 1 = 10.
Question 18.
Answer:
Explanation:
Started with the greater number, 6
I Counted on 3 more. 7, 8, 9
So, 3 + 6 = 9.
Question 19.
Answer:
Explanation:
Started with the greater number, 5
I Counted on 2 more. 6, 7
So, 2 + 5 = 7.
Question 20.
Answer:
Explanation:
Started with the greater number, 3
I Counted on 2 more. 4, 5
So, 3 + 2 = 5.
Problem Solving
Question 21.
Bella sees 2 buses. Then she sees 3 more buses. How many buses does she see in all?
____ buses
Answer:
5 buses
Explanation:
Bella sees 2 buses
Then she sees 3 more buses
Started with the greater number, 3
I Counted on 2 more. 4, 5
2 + 3 = 5
So, Bella sees 5 buses in all.
Question 22.
Jake saw 5 cars in the morning. He saw 3 more cars in the evening. How many cars did Jake see in all?
____ cars
Answer:
8 cars
Explanation:
Jake saw 5 cars in the morning
He saw 3 more cars in the evening
Started with the greater number, 5
I Counted on 3 more. 6, 7, 8
5 + 3 = 8
So, Jake sees 8 cars in all.
Write Math Explain how you count on to find 3 + 7.
____________________
____________________
____________________
Answer:
3 + 7 = 10
Explanation:
Started with the greater number, 7
I Counted on 7 more. 8, 9, 10
So, 3 + 7 = 10.
McGraw Hill My Math Grade 1 Chapter 3 Lesson 1 My Homework Answer Key
Practice
Start with the greater number. Count on to add.
Question 1.
7 + 2 = ___
Answer:
9
Explanation:
Started with the greater number, 7
I Counted on 2 more. 8, 9
So, 7 + 2 = 9.
Question 2.
4 + 3 = ____
Answer:
7
Explanation:
Started with the greater number, 4
I Counted on 3 more. 5, 6, 7
So, 4 + 3 = 7.
Question 3.
5 + 3 = ___
Answer:
8
Explanation:
Started with the greater number, 5
I Counted on 3 more. 6, 7, 8
So, 5 + 3 = 8.
Question 4.
6 + 1 = ___
Answer:
7
Explanation:
Started with the greater number, 6
I Counted on 1 more. 7
So, 6 + 1 = 7.
Question 5.
9 + 1 = ____
Answer:
10
Explanation:
Started with the greater number, 9
I Counted on 1 more. 10
So, 9 + 1 = 10.
Question 6.
2 + 5 = ____
Answer:
7
Explanation:
Started with the greater number, 5
I Counted on 2 more. 6, 7
So, 2 + 5 = 7.
Question 7.
8 + 3 = ___
Answer:
11
Explanation:
Started with the greater number, 8
I Counted on 3 more. 9, 10, 11
So, 8 + 3 = 11.
Question 8.
7 + 1 = ___
Answer:
8
Explanation:
Started with the greater number, 7
I Counted on 1 more. 8
So, 7 + 1 = 8.
Start with the greater number. Count on to add.
Question 9.
Answer:
Explanation:
Started with the greater number, 6
I Counted on 3 more. 7, 8, 9
So, 3 + 6 = 9.
Question 10.
Answer:
Explanation:
Started with the greater number, 8
I Counted on 2 more. 9, 10
So, 8 + 2 = 10.
Question 11.
Answer:
Explanation:
Started with the greater number, 8
I Counted on 1 more. 9
So, 1 + 8 = 9.
Question 12.
Answer:
Explanation:
Started with the greater number, 9
I Counted on 3 more. 10, 11, 12
So, 3 + 9 = 12.
Question 13.
Answer:
Explanation:
Started with the greater number, 6
I Counted on 2 more. 7, 8
So, 6 + 2 = 8.
Question 4.
Answer:
Explanation:
Started with the greater number, 9
I Counted on 2 more. 10, 11
So, 9 + 2 = 11.
Question 15.
Drew went to basketball practice 3 times this week. He went to soccer practice 2 times this week. How many practices did he go to in all?
____ practices
Answer:
5 practices
Explanation:
Drew went to basketball practice 3 times this week
He went to soccer practice 2 times this week
Started with the greater number, 3
I Counted on 2 more. 4, 5
3 + 2 = 5
So, Drew went to 5 practices in all.
Vocabulary Check
Circle the missing word.
count on sum
Question 16.
You can ________ to add when you join any number with 1, 2, or 3.
Answer:
count on
Explanation:
You can count on to add when you join any number with 1, 2, or 3.
Math at Home Say a number between 1 and 9. Ask your child to add 1, 2, and 3 to that number.
Answer:
Let the number be 5
5 + 1 =
Started with the greater number, 5
I Counted on 1 more. 6
5 + 1 = 6
5 + 2 =
Started with the greater number, 5
I Counted on 2 more. 6, 7
5 + 2 = 7
5 + 3 =
Started with the greater number, 5
I Counted on 3 more. 6, 7, 8
5 + 3 = 8.