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Texas Go Math Grade 2 Lesson 8.1 Answer Key Break Apart Ones to Subtract
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Write two addends for each sum.
FOR THE TEACHER • After children have recorded addends for each sum, have a class discussion about the different facts that children represented on their papers.
Answer:
Explanation:
Written The partners for the numbers.
Math Talk
Mathematical Processes
Describe how you chose addends for each sum.
Answer:
The addends are chosen according to the number from which we have to subtract
Model and Draw
Break apart ones. Subtract in two steps.
So, 63 – 7 = ____________.
Answer:
63 – 7 = 56
Explanation:
The partners of 7 are 3 and 4
63 – 3 = 60
60 – 4 = 56
Share and Show
Break apart ones to subtract. Write the difference.
Question 1.
Answer:
55 – 8 = 47
Explanation:
The partners of 8 are 5 and 3
55 – 5 = 50
50 – 3 = 47
Question 2.
Answer:
42 – 5 = 37
Explanation:
The partners of 5 are 2 and 3
42 – 2 = 40
40 – 3 = 37
Question 3.
41 – 9 = ___________
Answer:
41 – 9 = 32
Explanation:
The partners of 9 are 1 and 8
41 – 1 = 40
40 – 8 = 32
Question 4.
53 – 6 = _____________
Answer:
53 – 6 = 47
Explanation:
The partners of 6 are 3 and 3
53 – 3 = 50
50 – 3 = 47
Question 5.
44 – 7 = _____________
Answer:
44 – 7 = 37
Explanation:
The partners of 7 are 4 and 3
44 – 4 = 40
40 – 3 = 37
Question 6.
52 – 8 = ____________
Answer:
52 – 8 = 44
Explanation:
The partners of 8 are 2 and 6
52 – 2 = 50
50 – 6 = 44
Problem Solving
Break apart ones to subtract. Write the difference.
Question 7.
Answer:
75 – 7 = 68
Explanation:
The partners of 7 are 2 and 5
75 – 5 = 70
70 – 2 = 68
Question 8.
Answer:
86 – 8 = 78
Explanation:
The partners of 8 are 6 and 2
86 – 6 = 80
80 – 2 = 78
Question 9.
82 – 5 = __________
Answer:
82 – 5 = 77
Explanation:
The partners of 5 are 2 and 3
82 – 2 = 80
80 – 3 = 77
Question 10.
83 – 7 = __________
Answer:
83 – 7 = 76
Explanation:
The partners of 7 are 3 and 4
83 – 3 = 80
80 – 4 = 76
Question 11.
72 – 7 = ____________
Answer:
72 – 7 = 65
Explanation:
The partners of 7 are 2 and 5
72 – 2 = 70
70 – 5 = 65
Question 12.
76 – 9 = ___________
Answer:
76 – 9 = 67
Explanation:
The partners of 9 are 6 and 3
76 – 6 = 70
70 – 3 = 67
Solve. Write or draw to explain.
Question 13.
H.O.T. Multi-Step Cheryl brought 27 bagels for the bake sale. Mike brought 24 bagels. They sold all but 9of them. How many bagels did they sell?
_________ bagels
Answer:
39 bagels
Explanation:
Cheryl brought 27 bagels for the bake sale.
Mike brought 24 bagels.
They sold all but 90 of them.
27 + 24 = 51
90 – 51 = 39
39 bagels that they sell
Question 14.
H.O.T. Billy has 8 fewer marbles than Sara. Sara has 45 marbles. How many marbles does Billy have?
__________ marbles
Answer:
37 marbles
Explanation:
Billy has 8 fewer marbles than Sara.
Sara has 45 marbles.
45 – 8 = 37
37 marbles that Billy have
Daily Assessment Task
Choose the correct answer.
Question 15.
Use Tools Amanda had 43 stamps. She used 6 stamps to mail letters. How many stamps does she have now?
(A) 37
(B) 40
(C) 33
Answer: A
Explanation:
Amanda had 43 stamps.
She used 6 stamps to mail letters.
43 – 6 = 37
37 stamps that she have now
Question 16.
Analyze Amanda received 62 letters last year. 7 letters were from Texas. The rest were from other states. How many letters were from other states?
(A) 55
(B) 69
(C) 58
Answer: A
Explanation:
Amanda received 62 letters last year.
7 letters were from Texas.
62 – 7 = 55
The rest were from other states.
55 letters were from other states
Question 17.
TEXAS Test Prep Matthew had 73 blocks. He gave 8 blocks to his sister. How many blocks does Matthew have now?
(A) 68
(B) 65
(C) 81
Answer: B
Explanation:
Matthew had 73 blocks.
He gave 8 blocks to his sister.
73 – 8 = 65
65 blocks that Matthew have now
TAKE HOME ACTIVITY • Ask your child to describe how to find 34 – 6.
Answer:
34 – 6 = 28
Explanation: 34 – 6
6 is break apart as 4 and 2
34 – 4 = 30
30 – 2 = 28