Maryland Math 4.NOS.A.1.a

Math4th GradeNumber and Operation Sense

The Standard

4.NOS.A.1: Apply and extend place value understanding to multi-digit whole numbers within 1,000,000.

Read and write multi-digit whole numbers using base-ten numerals, number names, and expanded form.

Maryland College and Career Ready Standards for Mathematics (2025) · GENERALIZE PLACE VALUE UNDERSTANDING FOR MULTI-DIGIT WHOLE NUMBERS.

Teacher's field guide

What Students Need to Do: Students read multi-digit numbers aloud and write them as numerals, number names, and expanded form. They use place value to keep each digit, including zeros, in the right position.
What Mastery Looks Like: Given 405,072, a student writes “four hundred five thousand seventy-two” and 400,000 + 5,000 + 70 + 2. They can start with any of the three forms and write the other two.
Common Misconceptions: Students may read 405,072 as four hundred five thousand seven hundred two. They may drop a zero when writing the numeral or write 7 instead of 70 in expanded form.
How to Assess It: Exit ticket: Write 405,072 in words and expanded form. Circle each zero in the numeral and label its place.

Lesson moves

Give pairs digit cards 4, 0, 5, 0, 7, 2 and a place-value mat; have them build 405,072 and write its expanded form.
Ask, “Why does 405,072 need a zero in the ten-thousands place?” Have students explain in writing.
Play a card match with 405,072, its number name, and 400,000 + 5,000 + 70 + 2.
Tell students a library has 405,072 books; have them write the count in words and expanded form for a display sign.

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