Place value

This course is a part of Arithmetic, a 6-course Topic series from Khan Academy.

This course contains 13 segments:

Numbers 0 to 120

Learn the numbers from 0 to 120.

Ones and tens

Comparing 2-digit numbers

Learn how to compare two-digit numbers by thinking about place value (tens and ones).

Hundreds

Learn to see three-digit numbers as hundreds, tens, and ones

Comparing 3-digit numbers

Learn how to compare three-digit numbers by thinking about place value (hundreds, tens, and ones).

Rounding

Rounding is useful when you are trying to roughly estimate numbers.

Intro to place value

Learn about whole number place values, create numbers with given place values, and use place value blocks to identify a number.

How 10 relates to place value

Learn to multiply and divide whole numbers by 10. Learn how multiplying and dividing by 10 affects place value.

Ways to write whole numbers (expanded form and written form)

Learn to write whole numbers in expanded form, written form, and standard form.

Regrouping whole numbers

Regroup whole numbers based on their place values.

Comparing multi-digit numbers

Compare whole numbers with at least 3 digits.

Rounding whole numbers

If you're looking to create an army of robot dogs, will it really make a difference if you have 10,300 dogs, 9,997 dogs or 10,005 dogs? Probably not. All you really care about is how many dogs you have to, say, the nearest thousand (10,000 dogs). In this tutorial, you'll learn about conventions for rounding whole numbers. Very useful when you might not need to (or cannot) be completely precise. Common Core Standard: 4.NBT.A.3

Roman numerals