Florida B.E.S.T. MA.2.NSO.2.4
The Standard
Explore the addition of two whole numbers with sums up to 1,000. Explore the subtraction of a whole number from a whole number, each no larger than 1,000.
Florida B.E.S.T. Standards for Mathematics
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students combine and separate three-digit quantities by working with hundreds, tens, and ones. They use place-value models and explain when units must be composed or decomposed.
What Mastery Looks Like
- Students accurately solve addition and subtraction problems with and without regrouping. They use blocks, drawings, number lines, or equations and explain how hundreds, tens, and ones change.
Common Misconceptions
- Students may combine digits by column without regrouping or subtract the smaller digit from the larger digit in each place. They may also misalign hundreds, tens, and ones or struggle when a zero requires an exchange.
How to Assess It
- Give students 347 + 286 and 602 − 178. Ask them to solve each with a place-value drawing and explain one regrouping step.
Lesson moves
Ways to Teach It
Use base-ten blocks to solve 268 + 157 and 425 − 189, exchanging units whenever a place has too many or too few.
Ask students to compare two solutions for 356 + 278 and write which strategy is easier to follow and why.
Draw three digit cards, build two numbers, flip an operation coin, and earn a point for a correct model and solution.
Give students a school supply inventory and have them find totals after deliveries and remaining amounts after classroom orders.
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Printable MA.2.NSO.2.4 Worksheet
A ready-to-print activity worksheet aligned to MA.2.NSO.2.4, 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
- MA.K.NSO.3.1
Explore addition of two whole numbers from 0 to 10, and related subtraction facts.
- MA.1.NSO.2.4
Explore the addition of a two-digit number and a one-digit number with sums to 100.
- MA.3.NSO.2
Add and subtract multi-digit whole numbers. Build an understanding of multiplication and division operations.
- MA.2.NSO.2
Add and subtract two- and three-digit whole numbers.
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