Addition
Make the denominators the same, then add the numerators.
1/4 + 2/4 = 3/4
With different denominators: 1/2 + 1/3 = 3/6 + 2/6 = 5/6.
Subtraction
Use a common denominator, then subtract the numerators.
5/6 − 1/6 = 4/6 = 2/3
Always simplify your answer if possible.
Multiplication
Multiply the numerators together and the denominators together.
2/3 × 3/5 = 6/15 = 2/5
Division
Keep the first fraction, flip the second fraction, and multiply.
1/2 ÷ 3/4 = 1/2 × 4/3 = 4/6 = 2/3
The flipped fraction is called the reciprocal.
Check your answer: simplify where possible, and think about whether the size of your answer makes sense.