## Engage NY Eureka Math 1st Grade Module 2 Lesson 18 Answer Key

### Eureka Math Grade 1 Module 2 Lesson 18 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 – 8 = 5. Break thirteen into ten and three. Take eight from the ten. It’s called the take from ten strategy. Cross out eight circles. Then two and three on other side make five. The number sentence matches with the third picture in the right side.
b. In the above image we can observe a number sentence 14 – 8 = 6. Break fourteen into ten and four. Take eight from the ten. It’s called the take from ten strategy. Cross out eight circles. Then two and four make six. The number sentence matches with the second picture in the right side.
c. In the above image we can observe a number sentence 17 – 8 = 9. Break seventeen into ten and seven. Take eight from the ten. It’s called the take from ten strategy. Cross out eight circles. Then two and seven make nine. The number sentence matches with the first picture in the right side.
d. In the above image we can observe a number sentence 18 – 8 = 10. Break eighteen into ten and eight. Take eight from the ten. It’s called the take from ten strategy. Cross out eight circles. Then two and eight make ten. The number sentence matches with the fifth picture in the right side.
e. In the above image we can observe a number sentence 16 – 8 = 8. Break sixteen into ten and six. Take eight from the ten. It’s called the take from ten strategy. Cross out eight circles. Then two and six make eight. The number sentence matches with the fourth picture in the right side.

Make a math drawing of a 5-group row and some ones to solve the following problems. Write the addition sentence that shows how to add the parts after subtracting 8 or 9.

Question 2.
11 – 8 = ____       ____________________
11 – 8 = 3

The addition sentence is  2 + 1 = 3.
Explanation:
In the above image we can observe a number sentence 11 – 8 = 3. Draw a 5- group row. Break eleven into ten and one. First make a frame for ten then take eight from the ten. It’s called the take from ten strategy. Cross out eight circles in the frame. Then two circles in the frame and one circle on other side make three. The addition sentence is 2 + 1 = 3.

Question 3.
12 – 8 = ____       ____________________
12 – 8 = 4

The addition sentence is 2 + 2 = 4.
Explanation:
In the above image we can observe a number sentence 12 – 8 = 4. Draw a neat 5- group row. Break twelve into ten and two. First make a frame for ten then take eight from the ten. It’s called the take from ten strategy. Cross out eight circles in the frame. Then two circles in the frame and two circles on other side make four. The addition sentence is 2 + 2 = 4.

Question 4.
15 – 8 = ____      ____________________
15 – 8 = 7

The addition sentence is 2 + 5 = 7.
Explanation:
In the above image we can observe a number sentence 15 – 8 = 7. Draw a 5- group row. Break fifteen into ten and five. First make a frame for ten then take eight from the ten. It’s called the take from ten strategy. Cross out eight circles in the frame. Then two circles in the frame and five circles on other side make seven. The addition sentence is 2 + 5 = 7.

Question 5.
19 – 8 = ____      ____________________
19 – 8 = 11

The addition sentence is 2 + 9 = 11.
Explanation:
In the above image we can observe a number sentence 19 – 8 = 11. Draw a 5- group row. Break nineteen into ten and nine. First make a frame for ten then take eight from the ten. It’s called the take from ten strategy. Cross out eight circles in the frame. Then two circles in the frame and nine circles on other side make eleven. The addition sentence is 2 + 9 = 11.

Question 6.
16 – 8 = ____     ____________________
16 – 8 = 8

The addition sentence is 2 + 6 = 8.
Explanation:
In the above image we can observe a number sentence 16 – 8 = 8. Draw a 5- group row. Break sixteen into ten and six. First make a frame for ten then take eight from the ten. It’s called the take from ten strategy. Cross out eight circles in the frame. Then two circles in the frame and six circles on other side make eight. The addition sentence is 2 + 6 = 8.

Question 7.
16 – 9 = ____ ____________________
16 – 9 = 7

The addition sentence is 1 + 6 = 7.
Explanation:
In the above image we can observe a number sentence 16 – 9 = 7. Draw a 5- group row. Break sixteen into ten and six. First make a frame for ten then take nine from the ten. It’s called the take from ten strategy. Cross out nine circles in the frame. Then one circle in the frame and six circles on other side make seven. The addition sentence is 1 + 6 = 7.

Question 8.
14 – 9 = ____ ____________________
14 – 9 = 5

The addition sentence is 1 + 4 = 5.
Explanation:
In the above image we can observe a number sentence 14 – 9 = 5. Draw a 5- group row. Break fourteen into ten and four. First make a frame for ten then take nine from the ten. It’s called the take from ten strategy. Cross out nine circles in the frame. Then one circle in the frame and four circles on other side make five.

Question 9.
Show how to make ten and take from ten to solve the two number sentences.

a. 6 + 8 = ____

Explanation:
A number bond is a simple addition of two numbers that add up to give the sum. In the above image we can observe a number sentence 6 + 8 = 14. Break six into two parts as two and four. ADD two with eight then we got ten. ADD ten with four then we got fourteen.

b. 14 – 8 = ____

Explanation:
A number bond is a simple addition of two numbers that add up to give the sum. In the above image we can observe a number sentence 14 – 8 = 6. Break fourteen into two parts as ten and four. Subtract eight from ten then we got two. ADD two with four then we got six.

### Eureka Math Grade 1 Module 2 Lesson 18 Exit Ticket Answer Key

Draw 5-group rows, and cross out to solve. Complete the number sentences. Write the 2+ addition sentence that helped you add the two parts.

Question 1.
14 – 8 = ____

2 + ____ = ____

14 – 8 = 6
10 – 8 = 2
2 + 4 = 6
Explanation:
In the above image we can observe a number sentence 14 – 8 = 6. Draw a 5- group row. Break fourteen into ten and four. First make a frame for ten then take eight from the ten. It’s called the take from ten strategy. Cross out eight circles in the frame. Then two circles in the frame and four circles on other side make six. The 2 +addition sentence is 2 + 4 = 6.
Question 2.
17 – 8 = ____

2 + ____ = ____

17 – 8 = 9
10 – 8 = 2
2 + 7 = 9
Explanation:
In the above image we can observe a number sentence 17 – 8 = 9. Draw a 5- group row. Break seventeen into ten and seven. First make a frame for ten then take eight from the ten. It’s called the take from ten strategy. Cross out eight circles in the frame. Then two circles in the frame and seven circles on other side make nine. The 2 +addition sentence is 2 + 7 = 9.

### Eureka Math Grade 1 Module 2 Lesson 18 Homework Answer Key

Draw 5-group rows, and cross out to solve. Write the 2+ addition sentence that helped you add the two parts.

Question 1.
Annabelle had 13 goldfish. Eight goldfish ate fish food. How many goldfish did not eat fish food?

13 – 8 = 5
10 – 8 = 2
2 + 3 = 5

5 goldfish did not eat fish food.
Explanation:
Annabelle had 13 goldfish. Eight goldfish ate fish food. In the above image we can observe a number sentence 13 – 8 = 5. Draw a neat 5- group rows. Break thirteen goldfish into ten goldfish and three goldfish. First make a frame for ten goldfish then take eight goldfish from ten goldfish. It’s called the take from ten strategy. Cross out eight goldfish in the frame. Then two goldfish in the frame and three goldfish on other side make five. The 2+addition sentence is 2 + 3 = 5. Five goldfish did not eat fish food.

Question 2.
Sam collected 15 buckets of rain water. He used 8 buckets to water his plants. How many buckets of rain water does Sam have left?

15 – 8 = 7
10 – 8 = 2
2 + 5 = 7

Sam has 7 buckets of rain water left.
Explanation:
Sam collected 15 buckets of rain water. He used 8 buckets to water his plants. In the above image we can observe a number sentence 15 – 8 = 7. Draw a neat 5- group rows. Break fifteen buckets of rain water into ten buckets and five buckets. First make a frame for ten buckets then take eight buckets from ten buckets. It’s called the take from ten strategy. Cross out eight buckets in the frame. Then two buckets in the frame and five buckets on other side make seven. The 2+addition sentence is 2 + 5 = 7. Sam has seven buckets of rain water left.

Question 3.
There were 19 turtles swimming in the pond. Some turtles climbed up onto the dry rocks, and now there are only 8 turtles swimming. How many turtles are on the dry rocks?

19 – 8 = 11
10 – 8 = 2
2 + 9 = 11

There are 11 turtles on the dry rocks.
Explanation:
There were 19 turtles swimming in the pond. Some turtles climbed up onto the dry rocks, and now there are only 8 turtles swimming. In the above image we can observe a number sentence 19 – 8 = 11. Draw a neat 5- group rows. Break nineteen turtles  into ten turtles and nine turtles. First make a frame for ten turtles then take eight turtles from ten turtles. It’s called the take from ten strategy. Cross out eight turtles in the frame. Then two turtles in the frame and nine turtles on other side make eleven. The 2+addition sentence is 2 + 9 = 11. There are 11 turtles on the dry rocks.

Show making ten or taking from ten to solve the number sentences.

Question 4.
7 + 8 = ____

Explanation:
A number bond is a simple addition of two numbers that add up to give the sum. In the above image we can observe a number sentence 7 + 8 = 15. Break seven into two parts as two and five. ADD two with eight then we got ten. ADD ten with fiver then we got fifteen.

Question 5.
15 – 8 =____

Explanation:
A number bond is a simple addition of two numbers that add up to give the sum. In the above image we can observe a number sentence 15 – 8 =7. Break fifteen into two parts as ten and five. Subtract eight from ten then we got two. ADD two with five then we got seven.

Find the missing number by drawing 5-group rows.

Question 6.
11 – 9 = _____
11 – 9 = 2

Explanation:
Draw a 5 – group rows. Break eleven into ten and one. First make a frame for ten then take nine from the ten. It’s called the take from ten strategy. Cross out nine circles in the frame. Then one circle in the frame and one circle on other side make two. The missing number is two.

Question 7.
14 – 9 = _____
14 – 9 = 5

Explanation:
Draw a 5 – group rows. Break fourteen into ten and four. First make a frame for ten then take nine from the ten. It’s called the take from ten strategy. Cross out nine circles in the frame. Then one circles in the frame and four circles on other side make five. The missing number is five.

Question 8.
Draw 5-group rows to show the story. Cross out or use number bonds to solve. Write a number sentence to show how you solved the problem.

There were 14 people at home. Ten people were watching a football game. Four people were playing a board game. Eight people left. How many people stayed?
__ people stayed at home.