Maryland Math 3.NOS.A.1.d
The Standard
- 3.NOS.A.1
- Apply and extend place value understanding to whole numbers within 10,000.
Compare two whole numbers by reasoning about the values of the digits and the location of the numbers on a number line. Record the results of comparisons with the symbols >, =, and <.
Maryland College and Career Ready Standards for Mathematics (2025) · UNDERSTAND PLACE VALUE.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students compare hundreds first. If those match, they check tens, then ones. They use a number line and a comparison sign to show their answer.
What Mastery Looks Like
- A student explains that 438 is greater than 384 because it has four hundreds instead of three. They place 438 to the right of 384 on a number line and write 384 < 438.
Common Misconceptions
- A student may say 384 is greater than 438 because 8 tens is more than 3 tens, ignoring the hundreds. Others reverse the comparison sign or put the greater number on the left of a number line.
How to Assess It
- Exit ticket: Plot 472 and 427 on a number line from 400 to 500. Fill in 472 __ 427 and explain which digit helped you decide.
Lesson moves
Ways to Teach It
Give pairs base-ten blocks to build 356 and 365, then have them point to the first place where the values differ.
Write 406 and 460 on the board; ask students to explain how the position of the 6 changes its value.
Play comparison war: give pairs two three-digit number cards, a number line, and a recording sheet for each round.
Post two school fundraiser totals, $284 and $248; have students plot both amounts and write a comparison.
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Printable 3.NOS.A.1.d Worksheet
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Related Standards
- 4.NOS.A.1.c
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- 1.NOS.B.5
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- 5.NOS.A.3.c
Compare two decimals to thousandths by reasoning about the values of the digits and the location on the number line. Record the results of comparisons with the ...
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