Expanded Form
Build each three-digit number with hundreds, tens, and ones — then see its expanded form. Tap to add a hundreds-flat, a ten-rod, or a unit-cube; when it is right, the blocks reveal the place values that add up to the number (247 = 200 + 40 + 7). Numbers like 305 show that a zero tens place adds nothing — just 300 + 5. Aligned to Common Core 2.NBT.A.3 — reading and writing three-digit numbers in expanded form.
Build each three-digit number with hundreds, tens, and ones — then see its expanded form. Tap to add a hundreds-flat, a ten-rod, or a unit-cube; when it is right, the blocks reveal the place values that add up to the number (247 = 200 + 40 + 7). Numbers like 305 show that a zero tens place adds nothing — just 300 + 5. Aligned to Common Core 2.NBT.A.3 — reading and writing three-digit numbers in expanded form.
About this activity
This is a free, interactive learning activity for young children that plays right in the browser on tablets, phones, and classroom computers. There is nothing to install, no account to create, and no setup for the teacher.
It is aligned to Common Core 2.NBT.A.3 in the Number & Operations in Base Ten strand. Children work at their own pace with gentle, immediate feedback, and there is no timer and no score — just calm, hands-on practice.
What's inside this activity
- Designed for Grade 2 learners (ages about 5 to 9)
- Common Core strand: Number & Operations in Base Ten
- Aligned to Common Core standard 2.NBT.A.3
How to play
Children read or listen to the prompt and look at what is shown on the screen.
They tap to answer or build their response.
A friendly check shows when they are right, with an easy way to try again.
What your child practices
- Working through the Number & Operations in Base Ten skill at the heart of this activity
- Connecting pictures, numbers, or words to the idea being practised
- Trying, checking, and trying again without any pressure
- Building confidence one small step at a time
Learning goals
Practise and strengthen the Number & Operations in Base Ten skill behind Common Core 2.NBT.A.3.
Grow comfortable applying the idea in a playful, low-pressure way.
Build a foundation that later learning can grow from.
Frequently asked questions
- What does the Expanded Form activity teach?
- Expanded Form is a free interactive activity for Grade 2, focused on Number & Operations in Base Ten. Children play it right in the browser — no printing, login, or setup required.
- Is Expanded Form free to use?
- Yes. Expanded Form is completely free, with no signup and no paywall, on any tablet, laptop, or classroom whiteboard.
- Which ages is this activity for?
- It is designed for Grade 2 (Number & Operations in Base Ten) and works well for whole-class, small-group, or independent practice.