Fractions in recipes & sports

Fractions live outside the math book. They show up every time you cook a meal or watch a game. In this Unit 5 project lesson, you will use fractions to halve a recipe, double a batch, and judge how well a player performed.

Fractions in the Kitchen

A recipe lists exact amounts: 3/4 cup of flour, 1/2 cup of sugar, 1/4 cup of butter. If you want to make HALF the recipe, multiply every amount by 1/2. If you want to make DOUBLE, multiply by 2. The fraction tells you how much of one full cup to scoop.

1. Read each ingredient amount as a fraction of a cup
2. To halve: multiply each amount by 1/2 (so 3/4 becomes 3/8)
3. To double: multiply each amount by 2 (so 3/4 becomes 6/4 or 1 1/2)
4. Measure carefully — fractions in cooking must be exact

Fractions on the Scoreboard

Sports use fractions to describe how well a player or team did. A basketball player who makes 3 free throws out of 5 attempts has a free-throw fraction of 3/5. A soccer team that scored on 2 of 3 attempts has a scoring fraction of 2/3. The top number is what HAPPENED; the bottom is what was TRIED.

• 3/5 free throws made = 3 out of every 5 shots scored
• 2/3 goal attempts scored = 2 out of every 3 tries went in
• To compare 3/5 and 2/3: find a common denominator (15) — 3/5 = 9/15, 2/3 = 10/15, so 2/3 is the better rate
• A bigger fraction (closer to 1) means a stronger performance

Project Idea: Cook a Fraction

Pick a simple recipe at home (cookies, pancakes, smoothie). Write the original amounts as fractions. Then create TWO new versions: a halved version and a doubled version. Show your fraction math next to each ingredient.