## Engage NY Eureka Math 1st Grade Module 2 End of Module Assessment Answer Key

Question 1.
Mr. Baggy owns a pet store.
He counted 10 goldfish in a big tank and 5 goldfish in a small tank. He sold 8 goldfish out of the big tank. How many goldfish did he have left in all? Explain your answer using a labeled math drawing and a number sentence. 10  –  8  =  2                                   5
2 +5 = 7
Explanation:
Mr. Baggy owns a pet store. He counted 10 goldfish in a big tank and 5 goldfish in a small tank. He sold 8 goldfish out of the big tank. In order to calculate left over goldfish first we have to perform subtraction operation in big tank. subtract total number of gold fish sold out of the big tank from total number of  gold fish in the big tank. Subtract eight from ten. Then the left over gold fish in the big tank are two. Perform addition operation to get left over goldfish in both the tanks. ADD Number of goldfish left over in big tank with total number of goldfish in small tank. ADD two goldfish with five goldfish then we got left over gold fish in all are seven.

Question 2.
Write the numbers that make the number sentences true.
a. b. a. b. Explanation:
a. In the above image we can see the number sentences. The process of taking one number or amount away from another number is called as subtraction. we have to find out the number that makes the number sentence true.

•  Consider 12 – 9 = 3 number sentence. In that twelve can be written as ten and two. Subtract nine from ten. Add that difference with two then we got the number three which makes the number sentence true.
• Consider 11 – 8 = 3 number sentence. In that eleven can be written as ten and one. Subtract eight from ten. Add that difference with one then we got the number three which makes the number sentence true.
• Consider 15 – 6 = 9 number sentence. In that fifteen can be written as ten and five. Subtract six from ten. Add that difference with five then we got the number nine which makes the number sentence true.
b. In the above image we can see the number sentences. An addition sentence is a mathematical expression that shows two or more values added together and their sum.
• Consider 9 + 4 = 13 number sentence. ADD nine with four then we got thirteen.
• Consider 8 = 4 = 12 number sentence. ADD eight with four then we got twelve.
• Consider 12 = 5 + 7 number sentence. ADD five with seven then we got twelve.
• c. Write a related subtraction fact for each of the three problems in the last row in the spaces below. Explanation:
•  Consider 13 – 9 = 4 number sentence. In that thirteen can be written as ten and three. Subtract nine from ten. Add that difference with three then we got the number four.
•  Consider 12 – 8 = 4 number sentence. In that twelve can be written as ten and two. Subtract eight from ten. Add that difference with two then we got the number four.
•  Consider 12 – 7 = 5 number sentence. In that twelve can be written as ten and two. Subtract seven from ten. Add that difference with two then we got the number five.

Question 3.
Write a number bond in each number sentence to show how to use ten to subtract. Draw 5-groups and some ones to show each subtraction sentence.
a. 13 – 9 = 4

b. 12 – 8 = 4 Explanation:
a. In the above image we can see the 13 -9 = 4  number sentence. In that thirteen can be written as ten and three. Subtract nine from ten. Add that difference with three then we got the number four.
b. In the above image we can see the 12 -8 = 4  number sentence. In that twelve can be written as ten and two. Subtract eight from ten. Add that difference with two then we got the number four.

Question 4.
Mr. Baggy also has 9 birds, 15 snakes, and 12 turtles.
a. Show the number of snakes as a ten and some ones with a number bond, a 5-group drawing, and a number sentence. Explanation:
Mr. Baggy has 9 birds, 15 snakes, and 12 turtles. In the above image we can see the 15 = 10 + 5  number sentence. In that fifteen can be written as ten and five. Subtract five from ten. Add that difference with five then we got the number ten. Number of snakes are ten.

b. Mr. Baggy sold some snakes. Now, he has 5. How many snakes did he sell? Explain your solution using a number bond or a math drawing. Write a number sentence. Complete the statement.
Mr. Baggy sold _____ snakes. Mr. Baggy sold ten snakes.
Explanation:
Mr. Baggy has 15 snakes. He sold some snakes. Now, he has 5 five snakes. In the above image we can see the number sentence. In that fifteen can be written as ten and five. Subtract five from ten. Add that difference with five then we got the number ten. Number of snakes sold are ten.

c. Mr. Baggy sold 8 turtles. How many turtles does he have left? Explain your solution using a number bond or a math drawing. Write a number sentence. Complete the statement.
Mr. Baggy has ______ turtles left. Mr. Baggy has four turtles left.

Explanation:
Mr. baggy has 12 turtles. He sold eight turtles. In the above image we can see the number sentence. In that twelve can be written as ten and two. Subtract eight from ten. A number bond is a simple addition of two numbers that add up to give the sum. Add that difference with two then we got the number four. Number of turtles left with him are four.

d. Mr. Baggy’s daughter says she can find the number of turtles Mr. Baggy has left using subtraction or addition. Show two ways Mr. Baggy’s daughter can solve this problem. Explanation:
In the above image we can see the number sentences. In that we have to find the total number of turtles. Perform addition operation. Total number of turtles are twelve. ADD eight turtles with four turtles. In that twelve can be written as ten and two. Subtract eight from ten. A number bond is a simple addition of two numbers that add up to give the sum. Add that difference with two then we got the number four. Number of turtles left with him are four.

e. As Mr. Baggy gets ready to close his pet store for the day, he needs to know how many animals he has altogether. How many birds, snakes, and turtles does
Mr. Baggy have left in his store altogether? Explain your solution using number bonds or math drawings. Write a number sentence. Complete the statement.
Mr. Baggy has ______ animals left.  