Wyoming Math 1.OA.1
The Standard
Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, by using objects, drawings, or equations with a symbol for the unknown number to represent the problem.
2023 Wyoming Mathematics Content and Performance Standards · Represent and solve problems involving addition and subtraction.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students solve stories within 20 about getting more, losing some, combining, splitting, and comparing groups. They use counters, drawings, or equations with a box to show a missing start, change, or result.
What Mastery Looks Like
- Students can find the missing number wherever it appears in a story. For 'Mia has 8 stickers, 5 more than Leo,' they show 3 + 5 = 8 and explain that Leo has 3.
Common Misconceptions
- Students may add whenever they hear 'more,' even when they need to find the smaller group. They may put the box only at the end of an equation or combine two groups when the story asks for their difference.
How to Assess It
- Exit ticket: 'I had some buttons. I got 6 more. Now I have 14. How many did I start with?' Ask students to draw a picture and write an equation with a box.
Lesson moves
Ways to Teach It
Give pairs 20 linking cubes and a card reading 'I had some, got 4, now have 11'; ask them to build the missing amount.
Write 'Jae has 9 marbles, 3 more than Ana' on the board; ask partners whether Ana has 6 or 12 and why.
Play story swap: partners solve missing-number story cards with box equations, then trade cards and check each other's drawings.
Put 16 pencils in a supply cup, lend 5 to another table, and have students draw and write how many remain.
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Printable 1.OA.1 Worksheet
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Related Standards
- 1.OA.6
Add and subtract within 20, demonstrating fluency in addition and subtraction within 10. Use strategies such as counting on; making ten using the relationship b...
- K.OA.2
Solve word problems using objects and drawings to find sums up to 10 and differences within 10.
- 2.OA.1
Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart,...
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