Practice questions available in **McGraw Hill Math Grade 2 Answer Key PDF Chapter 5 Lesson 9 Ways to Add and Subtract **will engage students and is a great way of informal assessment.

## McGraw-Hill Math Grade 2 Answer Key Chapter 5 Lesson 9 Ways to Add and Subtract

**Explain**

**Circle the correct answer.**

Question 1.

You add 495 + 261. What should you add first?

add ones

add tens

add hundreds

Answer:

add ones

Question 2.

Which problem has the same sum as 648 + 290 = 938?

431 + 40

811 – 366

290 + 648

Answer:

290 + 648

Explanation:

The order of the addends may change but the sum of the numbers will be same

So, 648 + 290 = 938 = 290 + 648.

**Write your answer.**

Question 3.

Nate sees this problem in a book:

437 + = 720.

How can he find the missing addend?

__________ – ____________ = ___________

Answer:

720 – 437 = 283

Explanation:

437 + ? = 720

Subtract the addend from the sum

720 – 437 = ?

The difference is the missing addend

720 – 437 = 283

So, the missing addend is 283

Therefore, 720 + 437 = 720.

Question 4.

How can you use mental math to subtract 300 from 873? What is the answer?

Answer:

537 – 300 = 537

Explanation:

Use mental math to subtract

Subtract only hundreds

800 – 300 = 500

So, 837 – 500 = 537.

Question 5.

How can you use mental math to add 80 to 210? What is the answer?

Answer:

210 + 80 = 290

Explanation:

Use mental math to add

Add only tens

10 + 80 = 90

So, 210 + 80 = 290.