First graders learn that where a digit sits gives it its value, so they can break a two-digit number into tens and ones and compare numbers with confidence.
Students will be able to…
The same digit can mean three or thirty, depending on where it sits. How does a number's place give it its value?
Project this and answer each question about tens and ones — read the explanation after each one.
Tap any phase to open the teacher moves and student actions.
You have 34 straws. How could you group them to count fast?
Students answer questions about tens and ones.
Students break numbers apart.
Students build numbers with blocks.
Students reflect on why place matters.
Aligned to the Common Core State Standards for Mathematics.
Understand that the two digits of a two-digit number represent amounts of tens and ones.
Compare two two-digit numbers based on the meanings of the tens and ones digits.
Count to 120 and read and write numerals representing a number of objects.
Look for and make use of structure.
Preview the three formative checks. Tap “Sample answer” to see what mastery looks like — hide them before you print for students.
Have students pick a number up to 50, build it with ten-blocks and ones, and write it as tens and ones. A printable place-value worksheet is in the Mathematics library.
Tap a card to flip it, then rate whether you knew it. Built from this lesson’s vocabulary.
A quick self-check with instant feedback, drawn from this lesson’s key terms.
A print-and-go review sheet with a built-in answer key. Tap “Show answer key” to reveal answers, or print the clean version for students.