The set of whole numbers include the natural numbers and 0. Suppose we call this set W, then W = { 0,1,2,3,4,5,6,......}.
Natural number, also called counting numbers, are 1, 2, 3, 4...
The number line above only shows whole numbers from 0 to 10. However, not all numbers are shown. 50 is also a whole number. Similarly, 2000 is also a whole number as the following figure shows.
1 cube: physical representation of 1 
1 long : physical representation of 10 Made of 10 cubes. 
1 flat : physical representation of 100 Made of 100 cubes. 
1 block: physical representation of 1000 Made of 1000 cubes. 
Representation of 4

Place value
Start with this lesson. Then, study the following lessons in the order listed here from top to bottom.
Reading and writing whole numbers
Learn how to read and write numbers.
Adding whole numbers
Learn to add numbers with or without regrouping.
Subtracting whole numbers
Learn to subtract numbers with or without regrouping.
Multiplying whole numbers
Learn to multiply numbers with some great illustrations.
Lattice method for multiplication
After you learn the standard multiplication algorithm, entertain yourself with this fun and old way of doing multiplication.
Russian peasant multiplication
Learn to multiply with the Russian peasant algorithm.
Duplication algorithm for multiplication
Learn to multiply with the duplication algorithm.
Dividing whole numbers
Learn to divide numbers with good illustrations.
How to interpret the remainder
Learn 4 ways to interpret the remainder
Finding the average
A crystal clear lesson on how to find the average of numbers.
Weighted mean
How to find the weighted mean.
Harmonic mean
Find out what the harmonic mean is and how to calculate it.
Even and odd numbers
Learn the difference between even and odd numbers and see formal definitions for even and odd numbers.
Extras topics
Jan 20, 20 03:17 PM
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