Everyday Mathematics Grade 2, Unit 9: Equal Shares and Measurement
In this unit, your child finishes the year with equal shares and measuring. They split shapes into halves, thirds, and fourths, measure with rulers and tape measures, find how much longer one object is than another, and add and subtract on a number line. It builds on the shapes and arrays from the last unit and brings together the year's work with numbers to 100.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Unit 9?
- Seeing that equal shares of the same shape can look different, like a square cut into two triangles or two rectangles. Learn more: Halves, thirds, and fourths of shapes
- Choosing a ruler, yardstick, or measuring tape that fits the job, and measuring from the zero mark. Learn more: Measuring with a ruler, yardstick, or tape
- Measuring two objects in the same unit and subtracting to find how much longer one is. Learn more: Measuring how much longer one thing is
- Showing numbers as distances from 0 on a number line and making jumps to add and subtract within 100. Learn more: Adding and subtracting on a number line
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
How many fourths does it take to make one whole shape?
- Two
- Three
- Four
How you can help
- Ask your child where to cut a sandwich into two equal halves, once straight across and once corner to corner. Talk about why both ways make halves.
- Measure two spoons or two shoes with a ruler, in inches. Ask how much longer one is, and check by counting up from the shorter length.
- Draw a number line from 0 to 50 on the back of an envelope. Ask your child to jump from 35 forward 6, then back 6, and say where they land each time.
Where kids can get stuck
- Believing a triangle half and a rectangle half of the same square cannot both be halves.
- Adding the two lengths instead of subtracting, answering 12 inches for how much longer 7 inches is than 5.
- Counting the starting number as the first jump, so 35 + 6 lands on 40, one step short of 41.
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
- equal shares
- Parts of a whole that are all the same size.
- half
- One of 2 equal shares of a whole.
- third
- One of 3 equal shares of a whole.
- yardstick
- A measuring stick that is 1 yard, or 3 feet, long.
- number line
- A line with numbers marked in order, equally spaced.
- jump
- A move along a number line, forward to add or back to subtract.
- difference
- The answer when you subtract. In 13 - 5 = 8, the difference is 8.
- length
- How long something is from one end to the other.
Ready to build your child’s confidence with equal shares and measuring?
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.
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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 Everyday Mathematics Grade 2 Unit 9 cover?
Everyday Mathematics Grade 2 Unit 9 covers these math standards. Each one links to what it means, sample questions, and teaching strategies.
- 2.G.A.3: Partition circles and rectangles into two, three, or four equal shares.
- 2.MD.A.1: Measure the length of an object by selecting and using appropriate tools.
- 2.MD.A.4: Measure to determine how much longer one object is than another.
- 2.MD.B.6: Represent whole numbers as lengths from 0 on a number line diagram.
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.