## Math Expressions Common Core Grade 1 Unit 5 Lesson 1 Answer Key Unknown Partners with Teen Totals

**Math Expressions Grade 1 Unit 5 Lesson 1 Homework**

**Show your work. Use drawings, numbers, or words.**

**Solve the Story problem.**

Question 1.

9 zebras play. Then some more come to play. Now there are 13 zebras. How many zebras come to play?

Answer:

Explanation:

9 zebras play. Then some more come to play.

Now Total 13 zebras. 4 new more zebras come to play.

Since 13-9=4

Question 2.

There are 12 pumpkins on the porch. 6 are small and the others are large. How many are large?

Answer:

Explanation:

There are 12 pumpkins on the porch. 6 are small.

then rest 6 are large.

Since 12-6=6

Question 3.

Maya sees some ducks in a pond. 9 more ducks swim over. Now she sees 14 ducks. How many ducks did Maya see before?

Answer:

Explanation:

Maya sees some ducks in a pond. 9 more ducks swim over.

Now she sees 14 ducks. Then Maya sees 5 ducks before

Since 14 – 9 = 5

**Find the unknown partner.**

Question 4.

8 + __ = 12

Answer: 4

Explanation:

Sum of 8 and 4 is 12.

So answer is 4

Question 5.

9 + __ = 16

Answer: 7

Explanation:

Sum of 9 and 7 is 16.

So answer is 7

Question 6.

7 + __ = 15

Answer: 8

Explanation:

Sum of 8 and 7 is 15.

So answer is 8

Question 7.

6 + __ = 14

Answer:

Explanation:

Sum of 6 and 8 is 14.

So answer is 8

Question 8.

5 + __ = 11

Answer: 6

Explanation:

Sum of 5 and 6 is 11.

So answer is 6

Question 9.

6 + __ = 13

Answer: 7

Explanation:

Sum of 6 and 7 is 13.

So answer is 7

**Math Expressions Grade 1 Unit 5 Lesson 1 Remembering**

**Subtract.**

Question 1.

Answer:

Explanation:

Subtract 5 from 8 is 3

Question 2.

Answer:

Explanation:

Subtract 3 from 6 is 3

Question 3.

Answer:

Explanation:

Subtract 1 from 10 is 9

Question 4.

Answer:

Explanation:

Subtract 2 from 9 is 7

**Find the unknown partner.**

Question 5.

Answer:

Explanation:

Sum of 4 and 6 is 10.

So unknown partner is 6

Question 6.

Answer:

Explanation:

Sum of 7 and 2 is 9.

So unknown partner is 7

Question 7.

Answer:

Explanation:

Sum of 3 and 5 is 8.

So unknown partner is 5

Question 8.

Answer:

Explanation:

Sum of 1 and 6 is 7.

So unknown partner is 1

**Count on to add.**

Question 9.

42 + 7 = ___

Answer: 49

Explanation:

Counted from 42 to add 7 and answer is 49

So 42+7=49

Question 10.

67 + 6 = ___

Answer: 73

Explanation:

Counted from 67 to add 6 and answer is 73

So 67 + 6 = 73

Question 11.

76 + 3 = ___

Answer: 79

Explanation:

Counted from 76 to add 3 and answer is 79

So 76 + 3 = 79

Question 12.

55 + 7 = __

Answer: 62

Explanation:

Counted from 55 to add 7 and answer is 62

So 55 + 7 = 62

Question 13.

__ = 49 + 5

Answer: 54

Explanation:

Counted from 49 to add 5 and answer is 54

So 49 + 5 =54

Question 14.

__ = 85 + 5

Answer: 90

Explanation:

Counted from 85 to add 5 and answer is 90

So 85+ 5 =90

Question 15.

**Stretch Your Thinking** I see some birds. 8 more birds come. Now I see 12 birds. How many birds did I see before?

___ birds

Answer: 4

Explanation:

Subtract 8 from 12 is 4