Big Numbers
Thousands, lakhs and the quiet power of WHERE a digit sits
Free trail · Math · ages 9–10 · 6 stations
The Digit Houses
Every digit lives in a house, and the house decides how much it is worth. The same 7 can be worth seven — or seven thousand! Flip every card to walk down the street.
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The smallest house, on the right. A 7 here is worth just 7.
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One step left, ten times bigger. A 7 here is worth 70.
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Another step, another ×10. A 7 here is worth 700.
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A 7 here is worth 7,000. Notice the comma — it is a signpost, not a full stop!
This is one station of 6 in the trail, and finishing the trail earns an Explorer badge. Create a free account to play the rest →
Inside the app
The station above is the real thing — and it is one of 6. Inside the app your child plays the whole trail — every station is something they touch, drag and try, each one earns a checkmark, finishing the trail awards an Explorer badge, and the Practice Zone builds a fresh set of questions every visit. Progress is saved to their player, so they can stop and pick it up later.
What your child does, station by station
Learning mode has no timers, no scores and no wrong answers — every station is something the child touches and moves. This trail is one of the free ones, so it opens on any account.
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The Digit Houses
Flip cards
Every digit lives in a house, and the house decides how much it is worth. The same 7 can be worth seven — or seven thousand! Flip every card to walk down the street.
A digit’s value depends on the house it lives in. Flip the cards to tour the street!
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Number Builder
Slider explorer
Drag the slider and watch the SAME digits change value as the number grows. Look at the expanded form underneath — it shows what each house is really worth.
Slide to grow a number and watch every house fill up in expanded form.
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What Is That Digit Worth?
Try it
Find the digit, count which house it sits in, then say its value — not just its name.
Same digit, different house, totally different value. Practise reading the houses!
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Biggest to Smallest
The comparing trick: count the digits first — more digits always wins. Same number of digits? Then walk from the LEFT and find the first place they differ. Tap these from smallest to biggest.
Comparing big numbers: count the digits first, then walk left to right.
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Say It, Write It
Matching pairs
Reading big numbers aloud is easier if you read the groups: say the lakhs, say the thousands, then say the rest. Match each numeral to its spoken name!
Match each number to the way you would say it out loud.
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Practice Zone
Practice Zone
Ten quick questions on place value — a new set every visit.
Ten questions on this topic — a proper practice set, fresh every time.
Free printable worksheet
Ten questions from this topic on one page, with an answer key at the bottom — a PDF you can print for homework, a car journey or a classroom. No account needed and nothing to sign up for. The Practice Zone in the app builds a fresh set every visit; this is a fixed set you can hold.
More Math for ages 9–10
➕ Add & Subtract Big · ✖️ Multiplication Mastery · ➗ Division & Remainders · 🧬 Factors & Primes · 🍕 Fractions · 🧮 Fraction Arithmetic · 🔟 Decimals · 💯 Percentages
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