Virginia SOL 2.CE.1
SOL Standard (Knowledge and Skills Cluster)
The student will recall with automaticity addition and subtraction facts within 20 and estimate, represent, solve, and justify solutions to single-step and multistep problems, including those in context, using addition and subtraction with whole numbers where addends or minuends do not exceed 100.
Virginia Standards of Learning for Mathematics
Cluster contents
Knowledge and Skills in This Standard
2.CE.1 is a Standards of Learning standard. These are the knowledge and skills expectations under it.
- 2.CE.1.a
Apply strategies (e.g., rounding to the nearest 10, compatible numbers, other number relationships) to estimate a solution for single-step addition or subtracti...
- 2.CE.1.b
Apply strategies (e.g., the use of concrete and pictorial models, place value, properties of addition, the relationship between addition and subtraction) to det...
- 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 ...
- 2.CE.1.d
Demonstrate fluency with addition and subtraction within 20 by applying reasoning strategies (e.g., doubles, near doubles, make-a-ten, compensations, inverse re...
- 2.CE.1.e
Recall with automaticity addition and subtraction facts within 20.
- 2.CE.1.f
Use patterns, models, and strategies to make generalizations about the algebraic properties for fluency (e.g., 4 + 3 is equal to 3 + 4; 0 + 8 = 8).
- 2.CE.1.g
Determine the missing number in an equation (number sentence) through modeling and justification with addition and subtraction within 20 (e.g., 3 + = 5 or + 2 =...
- 2.CE.1.h
Use inverse relationships to write all related facts connected to a given addition or subtraction fact model within 20 (e.g., given a model for 3 + 4 = 7, write...
- 2.CE.1.i
Describe the not equal symbol (≠) as representing a relationship where expressions on either side of the not equal symbol represent different values and justify...
- 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 ...
Teacher's field guide
What This Cluster Means
What Students Need to Do
- Students quickly recall addition and subtraction facts within 20. They estimate and solve one-step and multistep problems with numbers up to 100, using models, place value, and related facts. They find missing numbers and explain whether two expressions are equal or not equal.
What Mastery Looks Like
- A student recalls facts within 20 without counting each object or finger. They choose and show an efficient method for addition and subtraction with numbers up to 100, then use an estimate to check the answer. They solve multistep stories, find missing values, write related facts, and justify equal or not equal comparisons.
Common Misconceptions
- Students may count every fact within 20 instead of using a known relationship. They may subtract the smaller digit from the larger digit in each column, regardless of place value. They may treat the equal sign as “the answer comes next,” or confuse an estimate with an exact answer.
How to Assess It
- Give this exit ticket: solve 8 + 7 and 15 − 9; estimate, then solve 47 + 28; find □ in 16 − □ = 9; decide whether 38 + 24 = 39 + 23 and explain. Add: “Mia had 34 stickers, received 18, then gave away 9. How many remain? Show both steps.”
Lesson moves
Ways to Teach It
Build 46 + 27 with base-ten blocks, trade ten ones, then sketch the model and write the matching equation.
Ask, “Is 45 − 9 equal to 46 − 10?” Students choose a side and justify with a model or words.
Play fact-family bingo using sums within 20, calling one equation while students cover a related addition or subtraction fact.
Use a class store price list; students estimate and find two-item totals below $100, then calculate change from $100.
Free download
Printable 2.CE.1 Worksheet
A ready-to-print activity worksheet aligned to 2.CE.1, with an answer key for the teacher on its own page. No account needed.
PDF, US Letter, prints cleanly in black and white.
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Related Standards
- 3.CE.2
The student will recall with automaticity multiplication and division facts through 10 × 10; and represent, solve, and justify solutions to single-step contextu...
- 1.CE.1
The student will recall with automaticity addition and subtraction facts within 10 and represent, solve, and justify solutions to single-step problems, includin...
- 3.CE.1
The student will estimate, represent, solve, and justify solutions to single-step and multistep problems, including those in context, using addition and subtrac...
- 4.CE.2
The student will estimate, represent, solve, and justify solutions to single-step and multistep problems, including those in context, using multiplication with ...
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