---
title: Decimals
description: This topic covers the representation and manipulation of fractional numbers using the base-ten system. Learners will understand how to perform arithmetic operations with decimals, convert between decimals and fractions, and solve real-world monetary problems.
category: mathematics
subcategory: arithmetic-and-pre-algebra
difficulty: beginner, intermediate, advanced
url: /subject/decimals
---

# Decimals

This topic covers the representation and manipulation of fractional numbers using the base-ten system. Learners will understand how to perform arithmetic operations with decimals, convert between decimals and fractions, and solve real-world monetary problems.

## Available Resources

1 Books • 3 Websites

## Websites

### 1. Khan Academy Decimals

Khan Academy's arithmetic unit on decimals, combining short videos with auto-graded practice. Covers place value, comparing and rounding, and adding, subtracting, multiplying and dividing decimals, so you can compute with them confidently and convert to and from fractions.

**Difficulty:** Beginner | **Price:** Free

**Link:** https://www.khanacademy.org/math/arithmetic-home/decimals

**Tags:** decimals, place-value, arithmetic, decimal-operations, practice-exercises

### 2. Wolfram MathWorld

**Author:** Eric W. Weisstein

MathWorld is an online mathematics encyclopedia from Wolfram Research offering detailed, browsable articles on topics across the math spectrum, including algebra, geometry, calculus, and number theory. Each entry includes definitions, theorems, formulas, diagrams, worked examples, and links to further reading.

**Difficulty:** Intermediate | **Language:** English | **Price:** Free

**Link:** https://mathworld.wolfram.com

**Tags:** mathematics-reference, encyclopedia, abstract-algebra, number-theory, geometry

### 3. mathsisfun.com

MathIsFun.com is a beginner-friendly math site that explains concepts with clear, step-by-step lessons and interactive activities. It covers topics from algebra and linear equations to geometry, fractions, data, and more, with practice problems, worksheets, and quizzes.

**Difficulty:** Intermediate | **Language:** English | **Price:** Free

**Link:** https://mathsisfun.com

**Tags:** websites, mathematics-statistics, algebra

## Books

### 1. Pre-Algebra

**Author:** Lynn Marecek, MaryAnne Anthony-Smith

Print edition of the OpenStax introductory textbook covering whole numbers, integers, fractions, decimals, percents, real-number properties, linear equations, basic geometry, polynomials and graphing. Worked examples and graded exercises build the fluency needed before starting a first algebra course.

**Difficulty:** Intermediate | **Language:** English | **Price:** Paid

**Link:** https://www.amazon.com/dp/9888407422?tag=edmonddante07-20

**Tags:** books, mathematics-statistics, arithmetic--pre-algebra

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