## Math Expressions Common Core Grade 3 Unit 6 Lesson 1 Answer Key Triangles

**Math Expressions Grade 3 Unit 6 Lesson 1 Homework**

**Look at the angles below.**

Question 1.

Which angles are right angles? ___

Answer:

B

Explanation:

By observing the given diagram only B has the right angles.

Question 2.

Which angles are larger than a right angle? ___

Answer:

C and E

Explanation:

The angles C and E are larger than a right angle in the given figure.

Question 3.

Which angles are smaller than a right angle? ____

Answer:

A and D

Explanation:

The angles A and D are smaller than the right angle in the given figure.

**Use the triangles for 4-7. Write W, X, Y, or Z. Then complete the sentences.**

Question 4.

Triangle has 3 angles smaller than a right angle and ___ sides of equal length.

Answer:

Triangle X has 3 angles smaller than a right angle and 3 sides of equal length.

Explanation:

As given in the figure, Triangle X has three angles smaller than a right angle and three sides of equal length.

Question 5.

Triangle ___ has 1 angle larger than a right angle and ___ sides of equal length.

Answer:

Triangle Z has 1 angle larger than a right angle and _0_ sides of equal length.

Explanation:

By observing the given figure given above, Triangle Z has 1 angle larger than a right angle and 0 sides of equal length.

Question 6.

Triangle ___ has 1 right angle and ___ sides of equal length.

Answer:

Triangle W has 1 right angle and 0 sides of equal length.

Explanation:

By observing the given figure given above, Triangle W has one right angle and 0 sides of equal length.

Question 7.

Triangle ___ has 3 angles smaller than a right angle and ___ sides of equal length.

Answer:

Triangle Y has 3 angles smaller than a right angle and 2 sides of equal length.

Explanation:

By observing the given figure given above, Triangle Y has three angles smaller than a right angle and two sides of equal length.

**Draw an example of each figure described below. Then name the figure.**

Question 8.

a polygon with 6 sides and 6 angles ___

Answer:

Hexagon

Explanation:

Question 9.

a polygon with 4 sides and 4 angles ___

Answer:

Quadrilateral

Explanation:

Question 10.

a polygon with 8 sides and 8 angles ___

Answer:

Octagon

Explanation:

**Math Expressions Grade 3 Unit 6 Lesson 1 Remembering**

**Write the number for each place value drawing.**

Question 1.

Answer:

1432

Explanation:

The number for each place value in the given drawing is 1432

Question 2.

Answer:

584

Explanation:

The number for each place value in the given drawing is 584.

**Write the number.**

Question 3.

600 + 30 + 8 = ___

Answer:

638

Explanations:

There are 6 of that unit (Thousands), plus 3 of that unit (tens), plus 8 of those (Ones). When we write the number, however, we omit the names of the units and the + signs and just write 638.

Question 4.

200 + 50 + 1 = ____

Answer:

251

Explanation:

There are 2 of that unit (Thousands), plus 5 of that unit (tens), *plus* 1 of those (Ones). When we write the number, however, we omit the names of the units and the + signs and just write 251.

Question 5.

8 hundreds + 7 ones = ____

Answer:

807

Explanation:

There are 8 of that unit (hundreds), plus 4 of those (Ones). When we write the number, however, we omit the names of the units and the + signs and just write 807.

Question 6.

2 thousands + 2 tens + 4 ones = ____

Answer:

2024

Explanation:

There are 2 of that unit (Thousands), plus 3 of that unit (tens), *plus* 4 of those (Ones). When we write the number, however, we omit the names of the units and the + signs and just write 2024.

**Solve each problem. Label your answer.**

There are 147 third grade students going to the theater. Each row at the theater has ten seats.

Question 7.

How many rows of seats will the third grade students fill?

Answer:

14 rows

Explanation:

There are a total of 147 third-grade students are going to the theater and each row has ten seats. So the number of row seats the third-grade students fill is 147÷10=14 rows.

Question 8.

How many students will be seated in a row that isn’t filled?

Answer:

7 students

Explanation:

The number of students who will be seated in a row that isn’t filled is 7 students.

Question 9.

**Stretch Your Thinking** Draw a right angle triangle with 0 sides of equal length.

Answer:

Explanation:

I have drawn a right-angle triangle with 0 sides of equal length.