Reveal Math Grade 2, Unit 3: Equal Groups
In this unit, your child looks at equal groups. They pair objects to decide whether a number is odd or even, write even numbers as doubles, and add the rows of an array to find the total. These ideas grow out of the fact fluency from the last unit and point toward multiplication in third grade. Next comes place value to 1,000.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Unit 3?
- Deciding whether a group of up to 20 objects is odd or even by making pairs, and writing even numbers as a sum of two equal addends. Learn more: Odd and even numbers
- Finding the total in an array of up to 5 rows and 5 columns with repeated addition, like 4 + 4 + 4 = 12. Learn more: Counting objects in equal rows by adding
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
Is 16 an even or odd number?
- Even
- Odd
- Neither
How you can help
- Pair up the shoes by the door and ask whether the number of shoes is odd or even. Count by 2s together to check.
- Arrange crackers in rows at snack time, like 3 rows of 5. Ask your child to say the adding sentence and find the total.
- Point out arrays at home or on a walk, like rows of windows or a muffin pan. Ask how many rows, how many in each row, and how many in all.
Where kids can get stuck
- Judging odd or even by size, thinking every small number is even and every big one is odd.
- Adding the number of rows to the number in each row, answering 8 for 3 rows of 5.
- Pairing objects but skipping one or counting a pair twice, so an even group looks odd.
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
- odd
- A number that has one left over when you make pairs, like 7 or 15.
- even
- A number that splits into pairs with none left over, like 6 or 14.
- pair
- A group of two.
- array
- Objects set out in equal rows and columns, like eggs in a carton.
- row
- A line of things that goes across.
- column
- A line of things that goes up and down.
- repeated addition
- Adding the same number again and again, like 5 + 5 + 5.
Want to help your child master odd, even, and arrays?
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 Reveal Math Grade 2 Unit 3 cover?
Reveal Math Grade 2 Unit 3 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.