Virginia SOL 2.CE.1.b
The Standard
Apply strategies (e.g., the use of concrete and pictorial models, place value, properties of addition, the relationship between addition and subtraction) to determine the sum or difference of two whole numbers where addends or minuends do not exceed 100.
Virginia Standards of Learning for Mathematics · 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.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students add numbers no greater than 100 and subtract from numbers no greater than 100. They break numbers into tens and ones, make a ten, use known facts, or connect subtraction to addition. They show how their strategy leads to the answer.
What Mastery Looks Like
- A student chooses a workable strategy, keeps tens and ones organized, and gets an accurate result. The student can show the steps with blocks, drawings, equations, or an open number line. For subtraction, the student can check the result with addition.
Common Misconceptions
- Students may ignore place value, writing 47 + 26 as 613 by joining 6 tens and 13 ones. Some solve 52 − 38 as 26 by subtracting the smaller digit from the larger digit in each place. Others forget to adjust the tens after making or breaking a ten.
How to Assess It
- Give this exit ticket: Solve 68 − 29 using a place-value drawing or open number line. Check the result with addition.
Lesson moves
Ways to Teach It
Give pairs base-ten blocks to build 47 + 36 and 82 − 45, then sketch and label each trade.
Students write two sentences explaining their strategy for 58 + 27, then compare explanations with a partner.
Play Strategy Match with cards showing equations, models, and decompositions, and have students form correct sets of three.
Set up a class store where students combine two prices or find change from $100 using play money and written work.
Free download
Printable 2.CE.1.b Worksheet
A ready-to-print activity worksheet aligned to 2.CE.1.b, with an answer key for the teacher on its own page. No account needed.
PDF, US Letter, prints cleanly in black and white.
Download the worksheetKeep exploring
Related Standards
- 4.CE.1.c
Apply strategies (e.g., place value, properties of addition, other number relationships) and algorithms, including the standard algorithm, to determine the sum ...
- 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...
- 3.CE.1.b
Apply strategies (e.g., rounding to the nearest 10 or 100, using compatible numbers, using other number relationships) to estimate a solution for single-step or...
- 3.CE.1.c
Apply strategies (e.g., place value, properties of addition, other number relationships) and algorithms, including the standard algorithm, to determine the sum ...
Turn this exact standard into a lesson
Grade, subject, topic, and the complete standard are prefilled. Create one free, no account needed.