Numbers

Counting · Place Value · Odd & Even · Comparing

Press Play to count 1–10 one by one · tap New for a random number 1–20.

8
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The 10 Digits

Every number in the world is written using just 10 digits. Combine them in different ways to make any number you need.

0
1
2
3
4
5
6
7
8
9
A digit is a single symbol used to represent a number. The digits 0–9 are the building blocks of our number system.
Number Line

Numbers increase as you move right and decrease as you move left.

0
1
2
3
4
5
6
7
8
9
10
The further right on the number line, the bigger the number. Negative numbers go to the left of 0.
Place Value

The position of a digit tells you its value. The number 4,537 breaks down like this:

ThousandsHundredsTensOnes
4 × 1,000
= 4,000		 5 × 100
= 500		 3 × 10
= 30		 7 × 1
= 7
4,000 + 500 + 30 + 7 = 4,537
Odd & Even

Every whole number is either even (divisible by 2) or odd (not divisible by 2).

Even Numbers

0
2
4
6
8
10
12
14

End in 0, 2, 4, 6 or 8

Odd Numbers

1
3
5
7
9
11
13
15

End in 1, 3, 5, 7 or 9

Comparing Numbers

Use these symbols to compare two numbers:

< Less than  |  > Greater than  |  = Equal to
25<4025 is less than 40
99>5699 is greater than 56
7 × 6=42Both equal 42
Key Facts
0 is the smallest whole number (and it is even).
There is no largest number — numbers go on forever (∞).
Adding any number to 0 leaves it unchanged: n + 0 = n.
Multiplying by 10 shifts every digit one place to the left.
A number with more digits is always larger (e.g. 100 > 99).