The digits have a job
Read tens and ones in teens, multiples of ten and other two-digit numbers.
Explore this lesson →9 practice questions · Optional read aloud · Thinking pad
Let’s understand the idea.
- The tens digit tells how many complete tens. The ones digit tells how many extra ones.
- Sixteen is one ten and six ones. Sixty is six tens and zero ones.
- In 64, the digit 6 represents six tens, with value 60.
Try it. Change it. Explain it.
Open the lesson to use its pictures and controls. In How it works, connect the picture to the idea. In Play & discover, change the quantities and notice what stays the same. In Your turn, answer questions and use the explanation to check your reasoning.
You can ask for help, draw on the thinking pad, or listen to the question and answer options. Progress distinguishes independent work from work completed with help.
Let’s try it →Curriculum connection
Grade 1 · 1.NBT · US Common Core
1.NBT.B.2 · 1.NBT.B.2.b · 1.NBT.B.2.c
This lesson is mapped to these standards. A completed activity is practice evidence, not a claim of mastery. Content is checked against the linked official standards and its mathematical models are tested.