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Lighthouse Beam Angles at the Harbor

Grade 4 angle addition practice: add lighthouse beam turns and subtract to find unknown angles in right, straight, and full-turn diagrams.

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, Circle the answer, Sorting, Short answer

About this worksheet

What students practice

Students add angle measures that do not overlap to find the measure of a whole angle.
Students write and solve addition or subtraction equations to find unknown angles in diagrams.
Students use 90°, 180°, and 360° to find missing angles in real-world problems.

How to use

Use after students can measure angles with a protractor. Before Part 2, review that a right angle is 90°, a straight angle is 180°, and a full turn is 360°.

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

Lighthouse Beam Angles at the Harbor

Add the beam's turns, and subtract to find the missing angles.

Add the turns

The beam of the Gull Point lighthouse turns around its lamp. When the beam makes two turns in a row with no gap and no overlap, add them to find the whole turn.

At sunset, the beam turns 35° and then 50° more. How many degrees does it turn in all?

The beam turns degrees in all.

The beam turns 70° from the dock to a sailboat. Then it turns 60° from the sailboat to the pier. What is the angle from the dock to the pier?

The angle from the dock to the pier is degrees.

Late at night, the beam turns 20°, then 45°, then 30°. How many degrees does it turn in all?