Fractions are a key part of math, showing how parts relate to wholes. They help us split things up, compare amounts, and do calculations. Understanding fractions is crucial for more advanced math and real-world problem-solving.
This section covers the basics of fractions, including how to simplify them and do math with them. We'll learn about , multiplying and dividing fractions, and how to convert words into fraction form. These skills are essential for working with fractions confidently.
Fractions
Equivalent fractions
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Represent the same value with different numerators and denominators
Multiplying or dividing both and by the same non-zero number creates an equivalent fraction (32=3×22×2=64)
Find an equivalent fraction by multiplying or dividing numerator and denominator by the same non-zero number
To find an equivalent fraction for 53, multiply both numerator and denominator by 2: 5×23×2=106
Equivalent fractions have the same value when simplified (42=21)
Useful for comparing fractions with different denominators (21 and 42 are equivalent, so they are equal)
Simplifying fractions
Fraction is in () when numerator and denominator have no common factors other than 1
86 is not in simplest form because 6 and 8 have a common factor of 2
Reduce fraction to simplest form by dividing numerator and denominator by their (GCF)
To reduce 86, divide both 6 and 8 by their GCF of 2: 8÷26÷2=43
Simplifying fractions makes them easier to compare and work with (86 and 43 represent the same value, but 43 is simpler)
Always simplify the result of fraction multiplication and division
Multiplication and division of fractions
Multiply fractions by multiplying numerators and multiplying denominators
32×54=3×52×4=158
Divide fractions by multiplying the first fraction by the of the second fraction
Reciprocal of a fraction is obtained by flipping numerator and denominator (54 has reciprocal 45)
32÷54=32×45=3×42×5=1210=65
Simplify the result of multiplication and division by reducing to lowest terms
Remember to multiply by the reciprocal when dividing fractions
Fraction bars in expressions
Act as grouping symbols, indicating expression above bar should be divided by expression below bar
ca+b means (a+b)÷c
Simplify expressions with fraction bars by performing operations in numerator and denominator separately, then dividing results
3+12+4=46=23
Fraction bars have higher precedence than addition and subtraction, but lower precedence than exponents
Treat numerator and denominator as separate expressions to simplify
Verbal to fractional conversions
Identify numerator and denominator based on verbal description
Words like "of," "out of," and "per" often indicate division and separate numerator and denominator ("Three out of five" can be written as 53)
Write fraction using identified numerator and denominator ()
"The ratio of a to b" can be written as ba
Pay attention to the order of the words to determine numerator and denominator
Look for key phrases that suggest a fraction, such as "out of," "divided by," and "ratio of"
Fractions and their representations
Fractions express a , where the numerator represents a part of the whole (denominator)
can be expressed as fractions, where the numerator is divided by the denominator
Fractions can be represented in different forms:
: dividing the numerator by the denominator (e.g., 21=0.5)
: multiplying the decimal form by 100 (e.g., 21=0.5=50%)