Eureka Math² Grade 4, Module 6: Angles, Two-Dimensional Figures, and Measurement
In this unit, your child closes the year with geometry and measurement. They draw lines, rays, and angles; measure angles in degrees with a protractor and find missing ones; sort shapes and find lines of symmetry; and convert units like feet to inches to solve story problems. It follows the fraction operations unit and wraps up the year.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Module 6?
- Converting larger units to smaller ones, like 5 feet to 60 inches, and completing conversion tables. Learn more: Converting feet to inches and kilograms to grams
- Solving measurement story problems that mix units, like finding a total time in hours and minutes. Learn more: Story problems about distance, time, and money
- Describing angles as turns, so a quarter turn is 90 degrees, a half turn 180, and a full turn 360. Learn more: What angles are and how degrees measure them
- Measuring angles in shapes with a protractor, and drawing angles like 120 degrees from a ray. Learn more: Measuring and drawing angles with a protractor
- Splitting a right or straight angle into parts, and finding an unknown part with addition or subtraction. Learn more: Adding angles together to find a missing one
- Identifying parallel and perpendicular lines, segments, rays, and right, acute, and obtuse angles inside two-dimensional figures. Learn more: Spotting lines, rays, angles, and parallel lines
- Sorting two-dimensional figures by parallel or perpendicular sides and by angle size, and naming right triangles. Learn more: Sorting shapes by their sides and angles
- Folding and drawing to find lines of symmetry in shapes, letters, and pictures. Learn more: Finding lines of symmetry
Sample questions to try together
These are real questions from our practice. Tap the speaker to hear one read aloud, or the light bulb for a hint, and talk about the answer together.
Question 1 of 3
Amara buys a 5-pound bag of oranges. How many ounces does the bag weigh?
- 60 ounces
- 21 ounces
- 80 ounces
How you can help
- Hunt for angles at home, like a partly open laptop or a pair of scissors. Have your child guess each angle in degrees and compare guesses with someone else.
- Fold a square napkin and a sheet of paper every way the edges match. Ask your child to count the folds: the square napkin has 4, the paper rectangle 2.
- Measure family members with a tape measure in feet and inches. Ask your child to change each height to inches, then check it on the tape.
Where kids can get stuck
- Guessing a reading when a ray is too short to reach the scale, instead of drawing it longer.
- Missing a line of symmetry because a shape is tilted on the page, as if it must stand upright.
- Calling two sides parallel because they look close, without checking they stay the same distance apart.
Practice makes perfect
Bobby's Math Club has practice problems that adapt to your child’s level, each with a detailed explanation and an easy-to-follow video, so your child can build confidence in these skills one step at a time.
Words your child will hear
- angle
- The figure made by two rays that share an endpoint.
- degree
- The unit for measuring angles; a full turn is 360 degrees.
- protractor
- A half-circle tool marked in degrees, used to measure and draw angles.
- parallel lines
- Lines that always stay the same distance apart and never meet.
- perpendicular lines
- Lines that meet or cross to make right angles.
- right triangle
- A triangle with one right angle.
- line of symmetry
- A line that folds a shape into two halves that match exactly.
- convert
- To change a measurement into a different unit, like 3 feet into 36 inches.
- conversion table
- A two-column table of matching amounts in two units, like 1 foot and 12 inches.
Want to help your child master angles and measurement?
In Bobby's Math Club, your child practices these skills at just the right level, with a hint when they need one, a clear explanation after every question, and kid-friendly videos. Unlimited practice is free.
Join the club
Written by Robert “Bobby” Barnett
Bobby is an award-winning math teacher, the author of Meet Every Learner’s Needs, and the father of two elementary-school math learners. He uses Bobby’s Math Club with his own kids a few times every week. Learn more or contact Bobby.
Which math standards does Eureka Math² Grade 4 Module 6 cover?
Eureka Math² Grade 4 Module 6 covers these math standards. Each one links to what it means, sample questions, and teaching strategies.
- 4.MD.A.1: Change larger units into smaller ones, like 4 feet = 48 inches.
- 4.MD.A.2: Solve word problems about distance, time, liquids, weight, and money.
- 4.MD.C.5: Understand angles as turns measured in degrees: a full turn is 360°.
- 4.MD.C.6: Measure angles in degrees with a protractor.
- 4.MD.C.7: Add angles together, and find a missing angle.
- 4.G.A.1: Name rays and angles, and spot parallel and perpendicular lines.
- 4.G.A.2: Sort shapes by their parallel sides and right angles.
- 4.G.A.3: Find lines of symmetry, where a shape folds into matching halves.
For teachers: Unit names and order vary between editions and districts, so your school’s own materials have the exact sequence. Learn how Bobby's Math Club can help your students grow.