Saxon Math Grade 4, Section 5: Angles Measurement Conversions & Geometry
In this unit, your child finishes the year with measurement and geometry. They convert larger units to smaller ones, learn that angles are measured in degrees, identify lines, rays, and angles, and sort shapes by their sides and angles. It follows the fraction and decimal unit and ties together the year's work.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Section 5?
- Converting yards to feet, feet to inches, pounds to ounces, and hours to minutes, using conversion tables. Learn more: Converting feet to inches and kilograms to grams
- Learning that angles are measured in degrees, with a right angle of 90 degrees and a full turn of 360. Learn more: What angles are and how degrees measure them
- Identifying and drawing lines, segments, rays, and right, acute, and obtuse angles, and naming parallel and perpendicular lines. Learn more: Spotting lines, rays, angles, and parallel lines
- Classifying triangles and quadrilaterals, like rectangles, rhombuses, and trapezoids, by their sides and angles. Learn more: Sorting shapes by their sides and angles
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
- Measure a room with a tape measure in feet. If it is 12 feet long, ask your child how many inches that is, 144, and how many yards, 4.
- Turn your body a quarter turn, a half turn, and a full turn on a walk. Ask your child how many degrees each turn is: 90, 180, and 360.
- Look for four-sided shapes on a walk, like windows, tiles, and signs. Ask your child to name each one and say which have parallel sides and right angles.
Where kids can get stuck
- Multiplying by 10 when converting feet to inches, so 3 feet becomes 30 inches instead of 36.
- Calling an angle bigger because it's drawn with longer rays, not because it opens wider.
- Thinking a rhombus can't be a parallelogram because it has its own name.
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
- convert
- To change a measurement into a different unit, like 3 feet into 36 inches.
- yard
- A length equal to 3 feet, or 36 inches.
- degree
- The unit for measuring angles; a full turn is 360 degrees.
- right angle
- An angle that measures exactly 90 degrees, like the corner of a sheet of paper.
- ray
- A part of a line that starts at one point and goes on forever in one direction.
- parallel lines
- Lines that always stay the same distance apart and never meet.
- perpendicular lines
- Lines that meet or cross to make right angles.
- quadrilateral
- A flat shape with four straight sides.
- rhombus
- A quadrilateral with four sides of equal length.
Want to help your child master geometry 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 Saxon Math Grade 4 Section 5 cover?
Saxon Math Grade 4 Section 5 covers these math standards. Each one links to what it means, sample questions, and teaching strategies.
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.