Florida B.E.S.T. MA.2.NSO.2.3
The Standard
Add two whole numbers with sums up to 100 with procedural reliability. Subtract a whole number from a whole number, each no larger than 100, with procedural reliability.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students calculate addition and subtraction problems within 100 using place value methods. They record steps clearly, regroup when needed, and check whether each answer is reasonable.
What Mastery Looks Like
- Students solve mixed addition and subtraction problems accurately, with and without regrouping. They line up place values, record trades correctly, and check answers using the inverse operation.
Common Misconceptions
- Students may misalign tens and ones or subtract the smaller digit from the larger digit in each column. They may trade a ten but forget to reduce the tens digit, or regroup ones incorrectly when adding.
How to Assess It
- Use an exit ticket with 38 + 47, 62 + 19, 74 - 28, and 100 - 63. Have students show each step and check one answer with the inverse operation.
Lesson moves
Ways to Teach It
Give pairs base-ten blocks to model 46 + 37 and 82 - 45, then match each trade to a written step.
Ask, "Why does 52 - 28 require trading a ten?" Students write two sentences and compare explanations with a partner.
Play Regroup or Not using prepared problem cards, with students sorting each card, solving it, and checking with a partner.
Set up a classroom store where students find totals under $1.00 and calculate change from $1.00 using whole-number cents.
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Printable MA.2.NSO.2.3 Worksheet
A ready-to-print activity worksheet aligned to MA.2.NSO.2.3, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- MA.3.NSO.2.4
Multiply two whole numbers from 0 to 12 and divide using related facts with procedural reliability.
- MA.4.NSO.2.2
Multiply two whole numbers, up to three digits by up to two digits, with procedural reliability.
- MA.K.NSO.3.2
Add two one-digit whole numbers with sums from 0 to 10 and subtract using related facts with procedural reliability.
- MA.1.NSO.2.2
Add two whole numbers with sums from 0 to 20, and subtract using related facts with procedural reliability.
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