House of Hundreds – II | Maths Grade 3 CBSE

Play with it

Six ideas about numbers to 999

Before and after, ordering, and jumps on a number line. Tap each term to see what it means, with an example you can try.

Explore · Up to 999tap a term

Learn

The biggest three-digit number is 999 — 9 hundreds, 9 tens and 9 ones.
After 999 comes 1000, the smallest four-digit number — a brand new place!
The smallest three-digit number is 100; the biggest two-digit number, 99, comes just before it.

Worked example. What comes just after 699?

699 + 1 = 700. The ones fill up, so a new ten and a new hundred begin.

Before is one less, after is one more. Between sits in the middle: 451 is between 450 and 452.
To order numbers, compare hundreds first, then tens, then ones.
To make the biggest number from some digits, put the largest digit in the hundreds place; for the smallest, put the smallest there.

Worked example. Make the biggest and smallest number from 4, 7, 2.

Biggest: 7 then 4 then 2 = 742. Smallest: 2 then 4 then 7 = 247.

A number line shows numbers in order from left (small) to right (big).
Take equal jumps to skip count: jumping by 100 from 200 lands on 300, then 400.
A number pattern follows a rule — find the rule to know the next number.

Worked example. Continue: 250, 260, 270, ___ .

The rule is “add 10”, so after 270 comes 280.

Common mix-up: after 199 comes 200, not 1000. Only when the hundreds also fill up (999 → 1000) do we add a new place.

Where you’ll meet it

In a big school, roll numbers run in order. Knowing before and after helps you find who sits next.

Ordering scores tells us who came first, second and third — smallest time wins a race.

Marks on a long scale are a number line — equal jumps help you read big measurements.

Check yourself

Nine friendly questions to check that you can use numbers up to 999 — before, after, ordering and number-line jumps.

Score 0/9