Worksheet

Adding Angles at the Pizza Party

Grade 4 angle addition with pizza slices: add angle parts, find unknown angles in diagrams, and solve angle word problems.

Grade 4MathInteractive · Printable

Aligned to4.MD.C.7

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What’s included

Single worksheet
Auto-graded online
1 Common Core standard
Printable answer key
12 questions
Classroom-ready

Details

Format: Interactive · Printable
Grade: Grade 4
Subject: Math
Question types: Fill in the blank, Multiple choice, Matching, Sorting, Short answer

About this worksheet

What students practice

Students find the measure of a whole angle by adding the measures of its non-overlapping parts.
Students find an unknown angle in a diagram by subtracting a known part from the whole angle.
Students write and solve equations to answer real-world angle problems.

How to use

Use after students can measure angles with a protractor. Remind them that angle parts that sit side by side add up to the whole angle, then let them work in pairs.

Curriculum

Common Core standard covered

4.MD.C.7

Understand that angle measures add, and find unknown angles in diagrams.

Preview

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Name Date

Adding Angles at the Pizza Party

Put pizza-slice angles together and find the missing slices.

Put the slices together

Each pizza slice makes an angle at the center of the pizza. Add the parts to find the whole angle.

Ravi puts two slices side by side. What is the angle of the two slices together?

The two slices make an angle of °.

A cut splits angle ABC into two slices. What is the measure of angle ABC?

Angle ABC = °

Lena puts three slices side by side with no gaps. The slices measure 40°, 40°, and 25°. What angle do all three slices make together?

A. 80°
B. 65°
C. 105°
D. 115°

Each friend puts two slices side by side. Match each pair of slices to the angle they make together.

55° and 25°
65° and 70°
90° and 75°
38° and 22°

A. 135°
B. 60°
C. 80°
D. 165°

Find the missing slice

Use the whole angle and the part you know. Find the angle marked x.

Two slices fill a right angle of 90°. One slice is 35°.

x = °

Half of a pizza makes a straight angle of 180°. Marco cuts the half into two slices. One slice is 115°.

x = °

Priya's big piece of pizza makes a 150° angle. She cuts it into two slices. One slice is 65°.

x = °

Which equation can you use to find x?

A. x = 130 + 50
B. x = 180 − 130
C. x = 130 − 50
D. x = 50 + 50

Use the protractor to read the whole angle. Then use the 60° part to find x.

Whole angle = °
x = °

Pizza angle puzzles

Add or subtract angle measures to solve each puzzle.

10.

Each pair of slices sits side by side. Sort the pairs: do they make a right angle (90°) or not?

45° and 45°40° and 40°30° and 60°50° and 50°25° and 65°35° and 45°

Makes 90°	Does not make 90°

11.

A whole pizza makes a full turn of 360° around its center. Mia takes a 90° slice, Theo takes a 120° slice, and Ava takes a 100° slice. What angle of pizza is left?

12.

Noah puts a 50° slice next to a 40° slice. He says the two slices make a 90° angle. Sam says they make a 10° angle because you subtract. Who is right? Explain.