Refer to our Texas Go Math Grade 2 Answer Key Pdf to score good marks in the exams. Test yourself by practicing the problems from Texas Go Math Grade 2 Lesson 5.1 Answer Key Addition Strategies.
Texas Go Math Grade 2 Lesson 5.1 Answer Key Addition Strategies
Explore
Draw a picture to show the problem. Then write an addition sentence for the problem.
_________ toy cars
David has 9 toy cars in his bag and he got 6 more toy cars as gifts on his birthday, now total how many cars David has?
Answer:
6 toy cars.
Explanation:
9 + 6 = 15
By using double fact we write 9 as 6 + 3
6 + 6 +3
=12 + 3
= 15
FOR THE TEACHER • Read the following problem and have children draw a picture for the problem. Nick has 4 toy cars. Adrian gives Nick 4 more toy cars. How many toy cars does Nick have now? After children draw pictures, have them write a number sentence for the problem.
Answer:
8 toy cars
Explanation:
Nick has 4 toy cars.
Adrian gives Nick 4 more toy cars.
4 + 4 is a double fact number.
So, Nick has 8 toy cars.
Math Talk
Mathematical Processes
Explain why 3 + 3 = 6 is called a doubles fact.
Answer:
A double fact in math is a doubled value that is easy to remember,
such as the equation 3 + 3 = 6 is called a doubles fact.
Explanation:
Any doubled number is a double fact,
but double facts are most commonly used when they are small numbers,
usually less than 12.
Model and Draw
Doubles facts can be used to find other sums.
5 + 5 = 10
Changing the order of addends does not change the sum.
7 + 1 = 8
1 + 7 = 8
3 + 6 = ___________
6 + 3 = ___________
Answer:
3 + 6 = 9
6 + 3 = 9
Explanation:
Changing the order of addends does not change the sum.
Share and Show
Question 1.
3 + 4 = ___________
Answer:
3 + 4 = 7
Explanation:
By using double fact we write 4 as 3 + 1
3 + 3 +1
=6 + 1
= 7
Question 2.
7 + 0 = ___________
Answer:
7 + 0 = 7
Explanation:
If 0 is added to any number the sum is the number itself.
Question 3.
___________ = 1 + 8
Answer:
9 = 1 + 8
Explanation:
By using double fact we write 8 as 4 + 4
4 + 4 +1
=8 + 1
= 9
Question 4.
2 + 3 = ___________
Answer:
2 + 3 = 5
Explanation:
By using double fact we write 3 as 2 + 1
2 + 2 +1
= 4 + 1
= 5
Question 5.
___________ = 5 + 1
Answer:
6 = 5 + 1
Explanation:
By using double fact we write 5 as 2 + 2 + 1
2 + 2 + 1 +1
= 4 + 1 + 1
= 5 + 1
= 6
Question 6.
4 + 2 = ___________
Answer:
4 + 2 = 6
Explanation:
By using double fact we write 2 as 1 + 1
4 + 1 +1
= 5 + 1
= 6
Question 7.
5 + 3 = ___________
Answer:
5 + 3 = 8
Explanation:
By using double fact we write 5 as 3 + 2
3 + 3 +2
= 6 + 2
= 8
Question 8.
4 + 4 = ___________
Answer:
4 + 4 = 8
Explanation:
4 + 4 are doubles to 8
So, the equation is a double fact.
Question 9.
___________ = 6 + 3
Answer:
9 = 6 + 3
Explanation:
By using double fact we write 6 as 3 + 3
3 + 3 + 3
=6 + 3
= 9
Question 10.
Answer: 6
Explanation:
3 + 3 are doubles to 6
So, the equation is a double fact.
Question 11.
Answer: 10
Explanation:
In double fact wee write 6 as 4 + 2
4 + 4 + 2
= 8 + 2
= 10
Question 12.
Answer: 8
Explanation:
If 0 is added to any number the sum is the number itself.