Hundreds, Tens, and Ones
Build each three-digit number using hundreds, tens, and ones. Tap to add a hundreds-flat, a ten-rod, or a unit-cube — and watch the number grow.
Build each three-digit number using hundreds, tens, and ones. Tap to add a hundreds-flat, a ten-rod, or a unit-cube — and watch the number grow.
About this activity
Tap a flat, a rod, or a cube and watch a three-digit number grow as the base-ten blocks stack up — hundreds-flats, ten-rods, and unit-cubes building targets from 108 to 974, including tricky zeros like 200, 305, and 906. It's a free, interactive Grade 2 math activity that runs right in the browser with no account.
The big idea is that the three digits of a number stand for hundreds, tens, and ones. To build 463, the child needs four hundreds-flats, six ten-rods, and three unit-cubes, and watching the blocks accumulate ties each digit to a real quantity. Numbers like 305 and 906 quietly teach that a zero means none of that place — no ten-rods at all — which is exactly where place-value confusion usually starts.
It is aligned to Common Core 2.NBT.A.1 — understanding that the three digits of a three-digit number represent amounts of hundreds, tens, and ones. No timer, no score — just calm, playful practice.
What's inside this activity
- Designed for Grade 2 learners (ages about 7–8)
- Common Core strand: Number & Operations in Base Ten
- Aligned to Common Core standard 2.NBT.A.1
How to play
Read the target number, like 463.
Tap to add hundreds-flats, ten-rods, and unit-cubes until the blocks make that number.
Watch the number grow; move on with no timer and no score.
What your child practices
- Build a three-digit number with the right hundreds, tens, and ones
- Connect each digit to a quantity of flats, rods, or cubes
- Understand that a zero in a place means none of that unit
- Read three-digit numbers up to the hundreds
Learning goals
Understand hundreds, tens, and ones in three-digit numbers — the focus of Common Core 2.NBT.A.1
Connect each digit to its place value and quantity
Build the place-value base for adding, subtracting, and comparing larger numbers
Frequently asked questions
- What does the Hundreds, Tens, and Ones activity teach?
- Hundreds, Tens, and Ones 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 Hundreds, Tens, and Ones free to use?
- Yes. Hundreds, Tens, and Ones 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.