enVision Mathematics Grade 2, Topic 2: Work with Equal Groups
In this unit, your child explores equal groups. They decide whether a number is odd or even by pairing objects, write even numbers as doubles, like 8 = 4 + 4, and add the rows of an array, objects set out in equal rows, to find the total. It uses the doubles from the facts work and quietly lays the ground for multiplication in 3rd grade.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Topic 2?
- Pairing objects to decide whether a number up to 20 is odd or even, and writing even numbers as doubles. Learn more: Odd and even numbers
- Adding equal rows in an array of up to 5 by 5 and writing a repeated addition equation like 3 + 3 + 3 + 3 = 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 total is odd or even. Then add one more shoe and ask again.
- Look for arrays in an egg carton, a muffin tin, or a window with panes, and ask your child to add the rows to find the total.
- Set out snacks in 3 rows of 5, and ask your child to write an addition sentence for the rows, such as 5 + 5 + 5 = 15.
Where kids can get stuck
- Pairing objects but skipping one or counting a pair twice, so a group of 10 looks odd.
- Writing an even number as any two addends, like 12 = 5 + 7, instead of the double 6 + 6.
- Counting an array one object at a time instead of adding the rows, and losing track in the middle.
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 can't be split into pairs without one left over, like 7.
- even
- A number that can be split into pairs with none left over, like 8.
- pair
- A group of two.
- double
- A number added to itself; 6 + 6 is the double that makes 12.
- array
- Objects arranged in equal rows and columns.
- row
- A line of objects going across.
- column
- A line of objects going up and down.
- repeated addition
- Adding the same number again and again, like 4 + 4 + 4.
Ready to build your child’s confidence with odd and even numbers?
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 enVision Mathematics Grade 2 Topic 2 cover?
enVision Mathematics Grade 2 Topic 2 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.