Virginia SOL 1.CE.1.f
The Standard
Represent, solve, and justify solutions to single-step addition and subtraction problems (join, separate, and part-part-whole) within 20, including those in context, using words, objects, drawings, or numbers.
Virginia Standards of Learning for Mathematics · The student will recall with automaticity addition and subtraction facts within 10 and represent, solve, and justify solutions to single-step problems, including those in context, using addition and subtraction with whole numbers within 20.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students make sense of one-step stories by deciding whether amounts are joined, separated, or combined as parts of a whole. They use objects, drawings, words, or equations to solve and explain their reasoning.
What Mastery Looks Like
- Students choose a matching model and operation for joining, separating, or finding a whole or part. They solve accurately within 20 and explain how their drawing, objects, or equation matches the situation.
Common Misconceptions
- Students may choose an operation from a keyword instead of thinking about what happens in the story. They may subtract in the wrong order, miscount drawings, or write an equation that does not match their model.
How to Assess It
- Give this exit ticket: “Leo has 8 toy cars and gets 6 more. How many cars does he have now? Show a model, write an equation, and explain your answer.”
Lesson moves
Ways to Teach It
Give pairs counters and a part-part-whole mat, then read story problems for them to build, solve, and explain.
Ask students to draw and explain two different stories that match 9 + 4 = 13.
Play Problem Match by having students pair story cards with the correct drawing and equation cards.
Set up a class store where students add purchased items or subtract spent tokens, then record each transaction with an equation.
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Printable 1.CE.1.f Worksheet
A ready-to-print activity worksheet aligned to 1.CE.1.f, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- 1.CE.1.e
Solve addition and subtraction problems within 20 using various strategies (e.g., inverse relationships: if 9 + 3 = 12 then 12 - 3 = 9; decomposition using know...
- 2.CE.1.c
Represent, solve, and justify solutions to single-step and multistep contextual problems (e.g., join, separate, part-part-whole, comparison) involving addition ...
- 3.CE.1.e
Represent, solve, and justify solutions to single-step and multistep contextual problems involving addition and subtraction with whole numbers where addends and...
- 4.CE.1.d
Estimate, represent, solve, and justify solutions to single-step and multistep contextual problems involving addition and subtraction with whole numbers where a...
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