## Engage NY Eureka Math 1st Grade Module 2 Lesson 15 Answer Key

### Eureka Math Grade 1 Module 2 Lesson 15 Problem Set Answer Key

Question 1.
Match the pictures with the number sentences.

Explanation:
a. In the above image we can observe a number sentence 13 – 9 = 4. Break thirteen into ten and three. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and three make four. The number sentence matches with the third picture in the right side.
b. In the above image we can observe a number sentence 14 – 9 = 5. Break fourteen into ten and four. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and four make five. The number sentence matches with the fifth picture in the right side.
c. In the above image we can observe a number sentence 17 – 9 = 8. Break seventeen into ten and seven. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and seven make eight. The number sentence matches with the fourth picture in the right side.
d.  In the above image we can observe a number sentence 18 – 9 = 9. Break eighteen into ten and eight. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and eight make nine. The number sentence matches with the second picture in the right side.
e. In the above image we can observe a number sentence 16 – 9 = 7. Break sixteen into ten and six. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and six make seven. The number sentence matches with the first picture in the right side.

Draw 5-group rows. Visualize and then cross out to solve. Complete the number sentences.

Question 2.
11 – 9 = __

The number sentence is 11 – 9 = 2.
Explanation:
In the above image we can observe a number sentence 11 – 9 = 2. Draw a neat 5-group rows. Break eleven into ten and one. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and another one on other side make two.
Question 3.
13 – 9 = __

The number sentence is 13 – 9 = 4.
Explanation:
In the above image we can observe a number sentence 13 – 9 = 4. Draw a neat 5-group rows. Break thirteen into ten and three. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and three on other side make four.

Question 4.
16 – 9 = __

The number sentence is 16 – 9 = 7.
Explanation:
In the above image we can observe a number sentence 16 – 9 = 7. Draw a neat 5-group rows. Break sixteen into ten and six. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and six on other side make seven.

Question 5.
17 – 9 = __

The number sentence is 17 – 9 = 8.
Explanation:
In the above image we can observe a number sentence 17 – 9 = 8. Draw a neat 5-group rows. Break seventeen into ten and seven. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and seven on other side make eight.

Question 6.
14 – 9 = __

14 – 9 = 5
Explanation:
In the above image we can observe a number sentence 14 – 9 = 5. Draw a neat 5-group rows. Break fourteen into ten and four. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and four on other side make five.

Question 7.
13 – 9 = __

13 – 9 = 4
Explanation:
In the above image we can observe a number sentence 13 – 9 = 4. Draw a neat 5-group rows. Break thirteen into ten and three. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and three on other side make four.

Question 8.
12 – 9 = __

12 – 9 = 3
Explanation:
In the above image we can observe a number sentence 12 – 9 = 3. Draw a neat 5-group rows. Break twelve into ten and two. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and two on other side make three.

Question 9.
15 – 9 = __

15 – 9 = 6
Explanation:
In the above image we can observe a number sentence 15 – 9 = 6. Draw a neat 5-group rows. Break fifteen into ten and five. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and five on other side make six.

Question 10.
Show making 10 and taking from 10 to complete the two number sentences.
a. 5 + 9 = ___
5 + 9 = 14

Explanation:
In the above image we can observe a number sentence 5 + 9 = 14. Draw a neat 5-group rows. Break five into two parts as four and one. ADD one with nine then we got ten. ADD ten with four then we got fourteen.

b. 14 – 9 = ___
14 – 9 = 5

Explanation:
In the above image we can observe a number sentence 14 – 9 = 5. Draw a neat 5-group rows. Break fourteen into ten and four. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and four on other side make five.

Question 11.
Make a number bond for Problem 10. Write two additional number sentences that use this number bond.

_________________ _________________

Explanation:
A number bond is a simple addition of two numbers that add up to give the sum. We have to make a number bond for problem 10. The number bond fourteen is obtained with nine and five numbers. The two additional sentences that use this number bond are
9 + 5 = 14 and 14 – 5 = 9. The number sentence 9 + 5 = 14  break five into two parts as four and one. ADD one with nine then we got ten. ADD ten with four then we got fourteen. The number sentence 14 – 5 = 9 break fourteen into ten and four. Take five from the ten. It’s called the take from ten strategy. Cross out five circles. Then five and four on other side make nine.

### Eureka Math Grade 1 Module 2 Lesson 15 Exit Ticket Answer Key

Draw 5-group rows, and cross out to solve. Complete the number sentences.

Question 1.
17 – 9 = ___
17 – 9 = 8

Explanation:
In the above image we can observe a number sentence 17 – 9 = 8.  Draw a neat 5-group rows. Break seventeen into ten and seven. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and seven on other side make eight.

Question 2.
19 – 9 = ___
19 – 9 = 10

Explanation:
In the above image we can observe a number sentence 19 – 9 = 10.  Draw a neat 5-group rows. Break nineteen into ten and nine. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and nine on other side make ten.

### Eureka Math Grade 1 Module 2 Lesson 15 Homework Answer Key

Write the number sentence for each 5-group row drawing.

Question 1.

Explanation:

a. In the above image we can observe a 5- group row drawing. Break thirteen into ten and three. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and three on other side make four. The number sentence is 13 – 9 =4.
b. In the above image we can observe a 5- group row drawing. Break sixteen into ten and six. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and six on other side make seven. The number sentence is 16 – 9 =7.
c. In the above image we can observe a 5- group row drawing. Break nineteen into ten and nine. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and nine on other side make ten. The number sentence is 19 – 9 =10.
d. In the above image we can observe a 5- group row drawing. Break seventeen into ten and seven. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and seven on other side make eight. The number sentence is
17 – 9 =8.
e. In the above image we can observe a 5- group row drawing. Break eighteen into ten and eight. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and eight on other side make nine. The number sentence is 18 – 9 =9.
f. In the above image we can observe a 5- group row drawing. Break fourteen into ten and four. Take nine from the ten. It’s called the take from ten strategy. Cross out nine circles. Then one and four on other side make five. The number sentence is 14 – 9 =5.

Draw 5-groups to complete the number bond, and write the 9– number sentence.

Question 2.

Explanation:
In the above image we can observe a number bond with fifteen and nine numbers. Fifteen can be written as ten and five. We can take nine from the ten inside the frame. Cross out nine circles inside the frame. There is one left in the frame and five on the other side. So another number is six. The number sentence 15 – 9 = 6. The 9- number sentence is 9 + 6 = 15.

Question 3.

Explanation:
In the above image we can observe a number bond with seventeen and nine numbers. Seventeen can be written as ten and seven. We can take nine from the ten inside the frame. Cross out nine circles inside the frame. There is one left in the frame and seven on the other side. So another number is eight. The number sentence 17 – 9 = 8. The 9- number sentence is 9 + 8 = 17.

Draw 5-groups to complete the number bond, and write the 9– number sentence.

Question 4.

Explanation:
In the above image we can observe a number bond with sixteen and nine numbers. sixteen can be written as ten and six. We can take nine from the ten inside the frame. Cross out nine circles inside the frame. There is one left in the frame and six on the other side. So another number is seven. The number sentence 16 – 9 = 7. The 9- number sentence is 9 + 7 = 16.

Draw 5-groups to show making ten and taking from ten to solve the two number sentences. Make a number bond, and write two additional number sentences that would have this number bond.

Question 5.
8 + 9 = ___