4.2.H

Math4th Grade

The Standard

determine the corresponding decimal to the tenths or hundredths place of a specified point on a number line

Texas Essential Knowledge and Skills for Mathematics

Teacher's field guide

What Students Need to Do: Students read a number line and name the decimal shown by a marked point. They use the endpoints and equal spaces to decide whether each interval represents tenths or hundredths.
What Mastery Looks Like: Students identify the labeled endpoints, determine the value of each equal space, and count intervals to the marked point. They correctly write decimals to the tenths or hundredths place, including values such as 0.4 and 0.37.
Common Misconceptions: Students may count tick marks instead of equal spaces, or assume every tick represents one tenth. They may also confuse tenths and hundredths or misread 0.35 as 0.305.
How to Assess It: Give students a number line from 0.3 to 0.4 divided into ten equal spaces, with the seventh tick after 0.3 marked. Ask them to write the marked decimal and explain the value of each space.

Lesson moves

Use masking tape to make a floor number line, then have students stand on assigned tenths and hundredths decimals.
Show a marked number line and ask, "How do the endpoints and equal spaces prove the point's decimal value?"
Play Decimal Point Match by pairing cards showing decimals with cards showing marked number lines.
Use a meter stick as a number line and connect tenths and hundredths to decimeters and centimeters.

Keep exploring

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