Master the World of Decimals
From money to measurements, decimals are everywhere! This page has everything you need to understand, practice, and conquer them.
Study Guide
1. The Basics: What are Decimals?
A decimal represents a part of a whole number. The dot is the decimal point. Digits to the right are parts of a whole, like fractions.
Try It Yourself!
In the number 12.345, what digit is in the hundredths place?
2. Adding & Subtracting Decimals
The most important rule is to line up the decimal points! Add zeros at the end to help line things up.
Try It Yourself!
Calculate: 23.8 + 5.45
3. Multiplying Decimals
First, multiply normally. Then, count the total decimal places in the problem to place the decimal in the answer.
Try It Yourself!
Calculate: 6.5 x 0.4
4. Dividing Decimals
Your goal is to make the divisor (the number you're dividing by) a whole number by moving the decimal.
Try It Yourself!
Calculate: 7.2 ÷ 0.9
5. Rounding Decimals
The rule: "5 or more, raise the score. 4 or less, let it rest."
Try It Yourself!
Round 12.583 to the nearest tenth.