Wyoming Math 2.OA.1
The Standard
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, and comparing, with unknowns in all positions, by using drawings and 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 one- and two-step stories with numbers within 100. They draw what happens and write equations with a box for the missing number, whether it comes first, in the middle, or at the end.
What Mastery Looks Like
- A student can solve a story about adding, taking away, combining parts, or comparing amounts, then show what each number means in a drawing. They can solve a two-step story, write an equation for each step, and check that the answer fits.
Common Misconceptions
- Students may add whenever they see “more,” even when the unknown is the starting amount. They may treat the last number in the story as the answer. In two-step problems, they may skip a change or write an equation that does not match their drawing.
How to Assess It
- Exit ticket: Maya started with some stickers, got 18 more, gave away 7, and now has 35. Ask students to find her starting amount with a drawing and equations using □.
Lesson moves
Ways to Teach It
Set out 46 counters, hide all but 19 under a cup, and ask pairs to sketch and solve □ + 19 = 46.
Write, “Rae has 42 marbles; Kai has 17 fewer.” Ask partners to draw two bars and explain which bar shows 42.
Put □ + 18 = 43 and 43 − □ = 18 on cards; pairs write and sketch a matching story for each.
Use a class library log: 54 books were on the shelf, some were checked out, and 31 remain; find how many left.
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Printable 2.OA.1 Worksheet
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Related Standards
- 3.OA.8
Solve two-step word problems (limited to the whole number system) using the four basic operations. Students should apply the Order of Operations when there are ...
- 1.OA.1
Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, wit...
- 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.
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