Wyoming Math K.OA.3
The Standard
Decompose numbers less than or equal to 10 in more than one way.
2023 Wyoming Mathematics Content and Performance Standards · Understand addition as putting together and adding to, and understand subtraction as taking apart and taking from.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students split up to 10 objects into two groups in more than one way. They use objects or drawings to show each split and check that the parts still make the whole.
What Mastery Looks Like
- Given 7 counters, a student can show 2 and 5, then 3 and 4. They can count both groups to show that each split still has 7 counters.
Common Misconceptions
- Students may lose track of a counter and make groups that do not add back to the starting number. Some think both groups must have objects, so they leave out a split with an empty group.
How to Assess It
- Give each student 7 counters and two drawn circles. Ask them to show and draw two different ways to put the counters in the circles, then label each group.
Lesson moves
Ways to Teach It
Give pairs eight buttons and two paper plates; have them make and draw three different splits.
Ask, 'Can one group be empty?' Have partners draw two ways to split six cubes, including one with an empty group.
Roll a number cube, take that many counters, and race to record two different splits into two cups.
Give students a picture of nine crackers and two snack bags; ask them to draw two ways to pack the crackers.
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Printable K.OA.3 Worksheet
A ready-to-print activity worksheet aligned to K.OA.3, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 2.NBT.1c
Three-digit numbers can be decomposed in multiple ways (e.g., 524 can be decomposed as 5 hundreds, 2 tens and 4 ones or 4 hundreds, 12 tens, and 4 ones, etc.)
- 1.NBT.4c
Understand that in adding two-digit numbers, adds tens and tens, ones and ones; and sometimes it is necessary to compose a ten.
- K.OA.4
For any number from 1 to 9, find the number that makes 10 when added to the given number.
- 2.NBT.7c
Understand that sometimes it is necessary to compose or decompose tens or hundreds.
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