Virginia SOL 2.NS.1.h
The Standard
Represent even numbers (up to 50) with concrete objects, using two equal groups or two equal addends.
Virginia Standards of Learning for Mathematics · The student will utilize flexible counting strategies to determine and describe quantities up to 200.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students use counters or other objects to split even quantities up to 50 into two equal groups. They connect each model to two equal addends, such as 8 + 8 = 16.
What Mastery Looks Like
- A student can split any even quantity up to 50 into two groups with the same number of objects. The student can record the model as two equal addends, such as 14 + 14 = 28.
Common Misconceptions
- Students may think any number ending in 0, 2, 4, 6, or 8 is enough proof without building equal groups. They may make two groups that differ by one or confuse two equal groups with groups of two.
How to Assess It
- Give each student 18 counters. Ask them to make two equal groups, draw the groups, and write 9 + 9 = 18.
Lesson moves
Ways to Teach It
Give pairs 36 counters and number cards to 50, then have them build two equal groups for each even card.
Ask students to explain why 24 can be written as two equal addends and show their thinking with a drawing.
Play Even Number Match by pairing each even number card with its correct equal-addends equation card.
Sort classroom items, such as 20 crayons or 32 cubes, into two equal containers and record each addition equation.
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Related Standards
- 2.NS.2.g
Compare two whole numbers, each 999 or less, represented concretely, pictorially, or symbolically, using words (greater than, less than, or equal to) and symbol...
- 2.NS.1.j
Determine whether a number (up to 50) is even or odd using concrete objects and justify reasoning (e.g., dividing collections of objects into two equal groups, ...
- 2.NS.1.a
Represent forward counting patterns when counting by groups of 2 up to at least 50, starting at various multiples of 2 and using a variety of tools (e.g., objec...
- 2.NS.1.i
Represent odd numbers (up to 50) with concrete objects, using two equal groups with one leftover or two equal addends plus 1.
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