Maryland Math 1.NOS.B.4

Math1st GradeNumber and Operation Sense

The Standard

Represent whole numbers as lengths from 0 on a number line (horizontal and vertical) with equally spaced points corresponding to whole numbers.

Maryland College and Career Ready Standards for Mathematics (2025) · UNDERSTAND PLACE VALUE AND REPRESENTATIONS OF NUMBERS.

Teacher's field guide

What Students Need to Do: Students make horizontal and vertical number lines with equally spaced marks. They show a whole number as a length from 0 to its mark.
What Mastery Looks Like: A student labels the points in order and keeps the spaces equal. They show 5 as five spaces from 0, whether the line runs across or up.
Common Misconceptions: Some students count the points instead of the spaces, so they stop at 4 when asked to show a length of 5. Others make uneven spaces or start the length at 1 instead of 0.
How to Assess It: Ask students to draw a horizontal and a vertical number line from 0 to 5, then mark the length from 0 to 4 on each. Check for equal spaces and four spaces in each marked length.

Lesson moves

Tape paper strips across a desk and up a wall, then use one cube to mark and label equal spaces from 0.
Show a length from 0 to 4 on printed horizontal and vertical number lines, and ask students what stays the same.
Roll a die, then draw a length from 0 to the rolled number on alternating horizontal and vertical number lines.
Make a wall height chart with cube-length spaces, then mark a toy's height as a length from 0.

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