Maryland Math 5.NOS.B.6.c

Math5th GradeNumber and Operation Sense

The Standard

5.NOS.B.6: Apply and extend previous understanding of addition and subtraction of whole numbers to add and subtract decimals to hundredths.

Use an algorithm to add and subtract decimals.

Maryland College and Career Ready Standards for Mathematics (2025) · PERFORM OPERATIONS ON MULTI-DIGIT WHOLE NUMBERS AND WITH DECIMALS TO HUNDREDTHS.

Teacher's field guide

What Students Need to Do: Students line up decimal places to add and subtract numbers through hundredths. They use a written algorithm, including placeholder zeros and regrouping when needed.
What Mastery Looks Like: A student can solve 6.20 − 1.85 and 3.47 + 1.8 with clear columns and correct regrouping. They can use an estimate to check whether each answer makes sense.
Common Misconceptions: Students may line up the last digits instead of the decimal points. They may leave out a placeholder zero or subtract the smaller digit from the larger one in each column without regrouping.
How to Assess It: Exit ticket: Solve 5.60 − 2.85 and 3.47 + 1.8 using a written algorithm. Show your columns and any regrouping.

Lesson moves

Give pairs paper hundred grids to model 2.35 + 1.47, then have them write the matching column calculation.
Ask students to write a note explaining why 6.2 − 1.85 needs a placeholder zero.
Make cards with decimal problems and answer cards; students solve, match, and check each match with a partner.
Hand out a mock receipt listing $2.49 and $3.75; students find the total and the change from $10.00.

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