Wyoming Math 1.OA.6
The Standard
Add and subtract within 20, demonstrating fluency in addition and subtraction within 10. Use strategies such as counting on; making ten using the relationship between addition and subtraction.
2023 Wyoming Mathematics Content and Performance Standards · Add and subtract within 20.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students add and subtract numbers up to 20. They count on, make ten, and use addition facts to solve subtraction problems. They answer facts within 10 quickly and accurately.
What Mastery Looks Like
- A student solves 8 + 5 by making 10 + 3. They use 8 + 5 = 13 to solve 13 − 5, and answer facts such as 7 + 2 without counting every object.
Common Misconceptions
- Some students count both groups from one instead of counting on from the larger number. When making ten, they may forget to add the counters left over. Others do not see that an addition fact can help with subtraction.
How to Assess It
- Give an exit ticket: Solve 8 + 5 and 13 − 5, showing how one answer helps with the other. Then solve 7 + 2 without counters.
Lesson moves
Ways to Teach It
Give pairs two ten-frames and 13 counters; build 8 + 5, move 2 counters to fill ten, then write 10 + 3 = 13.
Ask partners, 'If 9 + 4 = 13, how can that help you find 13 − 4?' Have them explain with a drawing.
Play a card flip with cards numbered 0 to 5; pairs add the numbers and name a matching subtraction fact before keeping the cards.
Set out 12 crayons, put 7 in a cup, and ask students to find how many remain using 7 + □ = 12.
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Printable 1.OA.6 Worksheet
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Related Standards
- 2.NBT.7
Add and subtract within 1,000, using concrete models or drawings and strategies based on place value, properties of addition, and/or the relationship between ad...
- 3.NBT.2
Fluently add and subtract within 1,000 using strategies and algorithms based on place value, properties of addition, and/or the relationship between addition an...
- 2.NBT.5
Add and subtract within 100 using strategies based on place value, properties of addition, and/or the relationship between addition and subtraction.
- 2.OA.2
Fluently add and subtract within 20 using mental strategies. By end of Grade 2, know automatically all sums of two one-digit numbers based on strategies.
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