Which numbers are round depend on the number system you use. For example, the number 1024 is not round in the base 10 system we use in our daily lives. However, 1024 is written as 10000000000 in the binary system, which is the number system a computer uses.

An integer that ends with one or more zeros.

An integer that starts with a 1 followed by zeros.

Every number in a multiplication problem that is multiplied is called a factor.

The result of multiplying numbers together.

Mathagon

Multiply by 10

Multiply by 100

Multiply by 1000

Multiply Powers of Ten

Multiply Round Numbers

Multiply Decimal and Round Numbers

You don't need long multiplication when you multiply by powers of ten.

The shortcut you'll learn here can help you save time and energy.

Learn what powers of ten are. Learn the fast and smart method of multiplying numbers by 10, 100, 1000 and other powers of 10. Online math course with videos.

Multiplying by Powers of Ten

Multiplying by 10 is quick and easy. Watch this video to learn how it works and why it works!

How to Multiply by 10

Multiplying by 100 is also quick and easy. Watch this video to learn how it works and why it works!

How to Multiply by 100

How to Multiply by 1000

The methods you've learned so far can be used for any integer that has 1 as its leading digit followed by zeros.

How to Multiply by Powers of Ten

This next method builds on what you've just learned about powers of ten. Here you'll learn how to multiply integers by round numbers.

How to Multiply by Round Numbers

How to Multiply a Decimal Number by a Round Number

You've arrived at the last method. Here you'll learn how to multiply a decimal number by a round number.

Introduction

Become a master of percent! Learn to convert between percentages, decimal numbers and fractions, as well as calculating discounts and growth factors.

Percent