Virginia SOL 1.CE.1.j
The Standard
Use concrete materials to model, identify, and justify when two expressions are not equal (e.g., 10 - 3 is not equal to 3 + 5).
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 use counters, cubes, or drawings to model two addition or subtraction expressions. They find each value, decide whether the values differ, and explain why.
What Mastery Looks Like
- Students correctly build and solve two expressions within 20. They identify unequal values and justify the comparison using models, numbers, or words.
Common Misconceptions
- Students may think expressions are unequal because they use different operations or numbers. They may also compare the written numbers without finding each expression's value.
How to Assess It
- Give students 8 - 2 and 4 + 3. Ask them to draw counters, solve both expressions, and write one sentence explaining the comparison.
Lesson moves
Ways to Teach It
Have students build two expression cards with counters, count each set, and place a not-equal card between sets with different totals.
Ask, “Are 9 - 4 and 2 + 4 equal?” Students draw models and write a sentence defending their answer.
Play Expression Match: students solve card pairs and sort them under Equal or Not Equal headings.
Compare two snack situations, such as crackers eaten and crackers added, then model whether the amounts left are equal.
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Related Standards
- 3.CE.1.d
Identify and use the appropriate symbol to distinguish between expressions that are equal and expressions that are not equal (e.g., 256 - 13 = 220 + 23; 457 + 1...
- 2.CE.1.j
Represent and justify the relationship between values and expressions as equal or not equal using appropriate models and/or symbols (e.g., 9 + 24 = 10 + 23; 45 ...
- 1.CE.1.k
Use concrete materials to model an equation that represents the relationship of two expressions of equal value.
- 4.CE.2.d
Identify and use the appropriate symbol to distinguish between expressions that are equal and expressions that are not equal, using addition, subtraction, multi...
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