# Texas Go Math Grade 2 Lesson 9.1 Answer Key 2-Digit Subtraction

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## Texas Go Math Grade 2 Lesson 9.1 Answer Key 2-Digit Subtraction

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Draw a quick picture to model each problem. FOR THE TEACHER • Read the following problem. Devin had 36 toy robots on his shelf. He moved 12 of the robots to his closet. How many robots are on the shelf now? Repeat the activity with this problem: Devin had 54 toy cars, Ne gave 9 of them to his brother. How many cars does Devin have now?
36 – 12 = 24
54 – 9 =  45
Explanation: Math Talk
Mathematical Processes

Explain how you know when to regroup.
when there is no sufficient ones to subtract
Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Model and Draw

Subtract.  Share and Show

Regroup if you need to. Write the difference.

Question 1.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 2.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 3.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Problem Solving

Regroup if you need to. Write the difference

Question 4.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 5.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 6.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 7.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 8.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 9.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 10.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 11.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 12.
H.O.T. Spencer wrote 5 fewer stories than Katie. Spencer wrote 18 stories. How many stories did Katie write? _________ stories
13 stories
Explanation:
Spencer wrote 5 fewer stories than Katie.
Spencer wrote 18 stories.
18 – 5 = 13
13 stories that Katie write

Question 13.
Circle the problems below that you could use mental math to solve.
54 – 10 = _________
63 – 27 = _________
93 – 20 = _________
39 – 2 = _________
41 – 18 = _________
82 – 26 = _________
The number which is in tens can be subtracted easily
Explanation: Question 14.
Analyze 61 pizzas were sold. 25 of them were plain cheese pizzas. The rest of the pizzas had toppings. How many pizzas with toppings were sold? (A) 36
(B) 16
(C) 26
Explanation:
61 pizzas were sold.
25 of them were plain cheese pizzas.
The rest of the pizzas had toppings.
61 – 25 = 36
36 pizzas with toppings were sold

Question 15.
Circle the problems below that you could use mental math to solve.
42 – 27 = _________
74 – 60 = _________
44 – 4 = _________
88 – 30 = _________
93 – 58 = _________
51 – 16 = _________
The number which is in tens can be subtracted easily
Explanation: Question 16.
TEXAS Test Prep There are 34 chickens in the barn. If 16 chickens go outside, how many chickens will still be in the barn?
(A) 18
(B) 50
(C) 42
Explanation:
There are 34 chickens in the barn.
If 16 chickens go outside,
34 – 16 = 18
18 chickens will still be in the barn

TAKE HOME ACTIVITY • Ask your child to write a 2-digit subtraction problem with no regrouping needed. Have your child explain why he or she chose those numbers.
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens
Explanation:
Without regrouping the number chosen are 25 – 14
25 – 14 = 11

### Texas Go Math Grade 2 Lesson 9.1 Homework and Practice Answer Key

Regroup if you need to. Write the difference

Question 1.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 2.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 3.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 4.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 5.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 6.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 7.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Question 8.  Explanation:
when we do not have enough ones to subtract
we have to regroup them to tens
then we subtract the ones
then subtract the tens

Problem Solving

Solve. Write or draw to explain.

Question 9.
Explanation:
15 + 16 = 31
62 – 31 = 31
31 oatmeal cookies that Angela have now

Lesson Check

Question 10.
There are 28 pigs in the barn. 19 pigs go outside to play in the mud. How many pigs are still in the barn?
(A) 9
(B) 47
(C) 17
Explanation:
There are 28 pigs in the barn.
19 pigs go outside to play in the mud.
28 – 19 = 9
9 pigs are still in the barn

Question 11.
Last night at Ray’s Ice Cream Parlor, 73 ice cream cones were sold. 37 were plain vanilla ice cream. The rest of the ice cream cones had sprinkles on them. How many ice cream cones with sprinkles were sold?
(A) 46
(B) 36
(C) 34
Explanation:
Last night at Ray’s Ice Cream Parlor,
73 ice cream cones were sold.
37 were plain vanilla ice cream.
The rest of the ice cream cones had sprinkles on them.
73 – 37 = 36
36 ice cream cones with sprinkles were sold

Question 12.
There are 27 different kinds of bagels. Katie has tried 8 kinds. How many kinds of bagels are left for her to try?
(A) 11
(B) 35
(C) 19
Explanation:
There are 27 different kinds of bagels.
Katie has tried 8 kinds.
27 – 8 = 19
19 kinds of bagels are left for her to try

Question 13.
Parker has 50 books to read by June. He has read 22 books by December. How many books does he have left to read?
(A) 38
(B) 18
(C) 28