## Math Expressions Common Core Grade 3 Unit 4 Lesson 9 Answer Key The Grouping Concept in Addition

**Math Expressions Grade 3 Unit 4 Lesson 9 Homework**

**Write each addition vertically. Decide which new groups you will make. Then, add to see if you were correct.**

Question 1.

256 + 273

A new ten? ____

A new hundred? _____

Answer:

256 + 273 = 529

A new ten 20

A new hundred is 500

Question 2.

784 + 41 _____

A new ten? _____

A new hundred? _____

Answer: 825

A new ten 20

A new hundred is 800

Question 3.

184 + 924 _____

A new ten? _____

A new hundred? _____

A new thousand? _____

Answer: 1108

A new ten 10

A new hundred is 100

A new thousand 1000

**Add.**

Question 4.

Answer: 911

Addition of two numbers

490 + 421 = 911

Question 5.

Answer: 867

Addition of two numbers

512+ 355 = 867

Question 6.

Answer: 1707

Addition of two numbers

1629 + 78 = 1707

Question 7.

Answer: 313

Addition of two numbers

239+ 7 4 = 313

Question 8.

Answer: 497

Addition of two numbers

198+299 = 497

Question 9.

Answer:

Addition of two numbers

1199+227 = 1426

**Write an equation and solve the problem.**

Question 10.

The orchard has 246 fruit trees and 59 pecan trees. How many trees does the orchard have altogether?

Answer:

Given,

The orchard has 246 fruit trees and 59 pecan trees.

246 + 59 = 305

**Math Expressions Grade 3 Unit 4 Lesson 9 Remembering**

**Estimate the length of the line segment in inches. Then measure it to the nearest inch.**

Question 1.

Estimate: ____

Actual: _____

Answer:

Estimate is 3 inches

Actual is 2 inches

Question 2.

Estimate: ____

Actual: _____

Answer:

Estimate is 4 inches

Actual is 3 and half

Question 3.

Estimate: ____

Actual: _____

Answer:

Estimate is 3 inches

**Solve the problem using a numerical method and a proof drawing.**

Question 4.

Sarah has 493 stickers in her collection. Tyler has 245 stickers in his collection. How many stickers do they have altogether?

Answer:

Given,

Sarah has 493

Tyler has 245

Altogether has 738

493 + 245 = 738

Question 5.

**Stretch Your Thinking** Write an addition equation that will have a new thousand, a new hundred, and a new ten. Then solve. Explain how you chose your numbers.

Answer:

A new ten 08

A new hundred is 100

A new thousand is 1000