Decimals and fractions are two ways to represent parts of a whole. Converting between them lets us compare values easily. This skill is crucial for everyday math, from cooking to finances.
Ordering decimals and fractions helps us rank things by size or value. It's useful in many situations, like comparing prices or test scores. Mastering these skills opens doors to more advanced math concepts.
Converting and Comparing Decimals and Fractions
Fraction and decimal conversions
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Divide by to convert to
43=3÷4=0.75
Write decimal as fraction over power of 10, then simplify to convert decimal to fraction
0.6=106=53
Convert repeating decimals to fractions using algebraic method
Let x equal
Multiply both sides of equation by power of 10 to shift decimal point
Subtract original equation from new equation
Solve for x and simplify resulting fraction
Convert fractions to percentages by multiplying by 100 ()
Ordering of decimals and fractions
Compare decimals digit by digit from left to right
Decimal with more digits is larger
Equal decimals have same digits
Convert fractions to decimals or find common denominator to compare
43 and 65 converted to decimals: 0.75<0.833
Convert all values to same form (decimals or fractions) to order from least to greatest or greatest to least
Use to compare approximate values when exact comparison is not necessary
Simplifying Expressions and Calculating with Circles
Order of operations with decimals
Follow : Parentheses, Exponents, and (left to right), and Subtraction (left to right)
Simplify expressions within parentheses first
Evaluate exponents (powers, roots, etc.)
Perform multiplication and division from left to right
Perform addition and subtraction from left to right
2+(0.5×3)−41=2+1.5−0.25=3.25
Circle calculations using decimals
Calculate using formula C=2πr, where r is
If r=2.5, then C=2π(2.5)=5π≈15.71
Calculate area using formula A=πr2
If r=23, then A=π(23)2=49π≈7.07
Approximate π as 3.14 or 722 when needed
Express final answer in terms of π if exact value required
Use to express appropriate level of precision in calculations
Ratios and Proportions
A ratio compares two quantities and can be written as a fraction
A is an equation stating that two ratios are equal
Use cross multiplication to solve proportions
Apply ratios and proportions to solve real-world problems involving scaling, rates, and comparisons