Look at this pizza cut into 4 equal slices:
How many slices are eaten? What fraction of the pizza is eaten?
Fraction: A part of a whole. It has a numerator (top number) and denominator (bottom number).
- Count the total number of equal parts (denominator)
- Count the number of shaded/picked parts (numerator)
- Write the fraction as numerator/denominator
The pizza is cut into 4 equal slices
2 slices are eaten (colored yellow)
Eaten slices over total slices = 2/4
2 slices are eaten, which is 2/4 of the pizza
• Equal parts: The whole must be divided into equal parts
• Numerator: Number of parts we have
• Denominator: Total number of equal parts
Look at this circle divided into 3 equal parts:
How many parts are colored? What fraction is colored?
Circle fractions: A circle divided into equal sectors where some are shaded.
The circle is divided into 3 equal parts
2 parts are colored (yellow)
Colored parts over total parts = 2/3
2 parts are colored, which is 2/3 of the circle
• Equal division: All parts must be the same size
• Parts relationship: Numerator counts what we have, denominator counts total
• Visual representation: Shaded areas represent the fraction
Look at this rectangle divided into 5 equal parts:
How many parts are shaded? What fraction is shaded?
Rectangle fractions: A rectangle divided into equal sections where some are shaded.
The rectangle is divided into 5 equal parts
2 parts are shaded (yellow)
Shaded parts over total parts = 2/5
2 parts are shaded, which is 2/5 of the rectangle
• Equal sections: All parts must have equal area
• Fraction formation: Numerator/shaded parts, Denominator/total parts
• Visual counting: Count shaded vs total visually
Whole: Complete object (value = 1)
Half: One of two equal parts (\(\frac{1}{2}\))
Quarter: One of four equal parts (\(\frac{1}{4}\))
Equal parts: All parts must have the same size
- Identify the whole: Recognize the complete shape/object
- Count equal parts: Determine how many equal sections exist
- Count shaded parts: See how many parts are selected
- Form the fraction: Put shaded over total
• Equal division: Parts must be equal in size
• Numerator: Number of parts we select
• Denominator: Total number of equal parts
• Value: Larger denominator = smaller parts
There are 8 apples in total:
How many red apples are there? What fraction of the apples are red?
Group fractions: Fractions can represent parts of a collection/group.
There are 8 apples in total
4 apples are red
Red apples over total apples = 4/8
4/8 = 1/2 (half of the apples are red)
4 red apples out of 8 total = 4/8 = 1/2 of the apples are red
• Group fractions: Fractions apply to collections too
• Simplification: 4/8 reduces to 1/2
• Part-to-whole: Red apples compared to total apples
Look at this group of 6 stars:
What fraction of the stars are yellow? What fraction are gray?
Comparative fractions: Multiple fractions from the same whole.
There are 6 stars in total
3 stars are yellow = 3/6 = 1/2
3 stars are gray = 3/6 = 1/2
3/6 + 3/6 = 6/6 = 1 whole (✓)
Yellow stars: 3/6 = 1/2, Gray stars: 3/6 = 1/2
• Multiple fractions: Same whole can have multiple fractional parts
• Sum equals whole: All fractions from same whole add to 1
• Simplification: 3/6 reduces to 1/2
Whole: Complete object or group (equals 1)
Half: One of two equal parts (\(\frac{1}{2}\))
Third: One of three equal parts (\(\frac{1}{3}\))
Quarter: One of four equal parts (\(\frac{1}{4}\))
Equal parts: All sections must have identical size/area
- Identify the whole: Recognize the complete shape, object, or group
- Check equal division: Ensure all parts are the same size
- Count total parts: Determine denominator
- Count selected parts: Determine numerator
- Form fraction: Write as numerator/denominator
- Simplify if needed: Reduce to lowest terms
• Basic fraction: \(\frac{part}{whole}\)
• Whole equals: \(\frac{n}{n} = 1\) (any number over itself)
• Half: \(\frac{1}{2} = \frac{2}{4} = \frac{3}{6} = \frac{4}{8}\)
• Comparison: Larger denominator = smaller pieces
• Addition: \(\frac{a}{n} + \frac{b}{n} = \frac{a+b}{n}\)
Whole pizza = 1
4 equal slices = \(\frac{1}{4}\) each
2 slices eaten = \(\frac{2}{4} = \frac{1}{2}\)
Circle divided in 3 = \(\frac{1}{3}\) each
2 parts shaded = \(\frac{2}{3}\)
All 3 parts = \(\frac{3}{3} = 1\) whole
Rectangle in 5 parts = \(\frac{1}{5}\) each
3 parts shaded = \(\frac{3}{5}\)
Unshaded = \(\frac{2}{5}\)
\(\frac{1}{2} > \frac{1}{3} > \frac{1}{4} > \frac{1}{5}\)
Larger denominator = smaller fraction