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Classroom Math

Clear, reliable math tools for students, teachers and parents. Every answer is worked out step by step. Compile, Check, Practice.

28 free tools

What do you need?10 topics

Percentages

8 tools

Classroom Math

Percentage Calculator

Find a percentage of any number, instantly.

37% of 240

88.8

Open

Classroom Math

Percentage Increase Calculator

See the percentage increase between two values.

Percentage increase

25%

Change20

Open

Classroom Math

Percentage Decrease Calculator

See the percentage decrease between two values.

Percentage decrease

20%

Decrease20

Open

Classroom Math

Percentage Change Calculator

The percentage change from one value to another.

Percentage change

+30%

DirectionIncrease

Open

Classroom Math

Reverse Percentage Calculator

Find the original value before a percentage change.

Original value

100

Multiplier× 1.2

Open

Classroom Math

Percentage Difference Calculator

The percentage difference between two numbers.

Percentage difference

40%

Open

Classroom Math

Percentage Discount Calculator

Work out the discount and the final price.

Final price

You save20

Open

Classroom Math

Fraction to Percentage

Turn a fraction into a percentage.

As a percentage

75%

Open

Fractions

3 tools

Classroom Math

Fraction Calculator

Add, subtract, multiply and divide fractions.

Result

5/6

As a decimal0.833333

Open

Classroom Math

Simplify Fractions

Reduce a fraction to its simplest form.

Simplified

3/4

Divided top & bottom by6

Open

Classroom Math

Fraction to Decimal

Convert a fraction to a decimal.

As a decimal

0.375

Open

Ratios

3 tools

Classroom Math

Ratio Calculator

Simplify a ratio to its lowest terms.

Simplified ratio

2 : 3

Divided both by6

Open

Classroom Math

Proportion Calculator

Solve a/b = x/d for the missing value.

Open

Classroom Math

Unit Rate Calculator

Find the cost or amount per single unit.

Per unit

Open

Algebra

2 tools

Classroom Math

Linear Equation Calculator

Solve ax + b = c for x.

Open

Classroom Math

Quadratic Formula Calculator

Solve ax² + bx + c = 0 using the quadratic formula.

Roots

x = 3 or 2

Discriminant1

NatureTwo real roots

Open

Geometry

3 tools

Classroom Math

Triangle Area

Area of a triangle from base and height.

Area

Open

Classroom Math

Circle Area

Area of a circle from its radius.

Area

78.539816

In terms of π25π

Open

Classroom Math

Pythagorean Theorem

Find a missing side of a right triangle.

Hypotenuse c

Open

Exponents & Roots

2 tools

Classroom Math

Exponent Calculator

Raise a base to any power.

2^5

Open

Classroom Math

Square Root Calculator

Find the square root of a number.

√144

Check12² = 144

Open

Logarithms

2 tools

Classroom Math

Logarithm Calculator

Calculate a logarithm in any base.

log2(32)

Open

Classroom Math

Natural Log Calculator

Calculate ln(x) — log base e.

ln(20)

2.995732

Open

Statistics

3 tools

Classroom Math

Mean Calculator

The average of a set of numbers.

Mean

Median Calculator

The middle value of a set of numbers.

Median

Sorted1, 3, 5, 7, 9

Open

Classroom Math

Standard Deviation Calculator

Measure the spread of a data set.

Population standard deviation

Mean5

Variance4

Open

Probability

1 tool

Classroom Math

Probability Calculator

The probability of a single event.

Probability

0.166667

As a percentage16.666667%

As a fraction1/6

Open

Financial Math

1 tool

Classroom Math

Compound Interest Calculator

See how money grows with compound interest.

Final amount

1,647.01

Interest earned647.01

Principal1,000

Open

TREETL Classroom tools run entirely on your device using deterministic math. Teachers can embed any tool on their own class site.

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