Curriculum placement
Grade 2. This describes the skill, not a learner estimate.
Odd and even numbers
Determine parity by pairing or grouping
Problem types
- Pair the counters
- Even number as two equal addends
Builds on
Leads to
- Patterns that follow a rule · Extend the idea
Adding an even number keeps a number odd or even; adding an odd number switches it. This explains patterns that stay odd or alternate.
- Multi-step word problems · See it applied
When each kit holds two items, an even total fills complete kits. An odd total leaves one item over.
- Unions, intersections, and complements · See it applied
Even and odd outcomes form sets. Listing their members helps count outcomes when finding probabilities.
Related skills
- Skip-counting · Related idea
Counting by twos lands only on even numbers, so skip counting by 2 shows which numbers are even.
- Factors, multiples, primes, and composites · Related idea
An even positive whole number has 2 as a factor: it can be written as 2 times another whole number.
- Adding within 10 · Shared foundations
- Comparing two groups by matching · Shared foundations
- Counting by ones and by tens · Shared foundations
Open the interactive map to explore lessons and skill connections.