Mathematics
Grade 4
15 min
Compare fractions
Compare fractions
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1
Introduction & Learning Objectives
Learning Objectives
Compare two fractions with the same denominator by comparing their numerators.
Compare two fractions with the same numerator by comparing their denominators.
Use the benchmark fraction 1/2 to compare two fractions.
Find a common denominator to compare two fractions with different numerators and denominators.
Correctly use the symbols < (less than), > (greater than), and = (equal to) to record the results of fraction comparisons.
Solve word problems that involve comparing fractions.
Would you rather have 1/2 of a pizza or 1/8 of a pizza? 🍕 Knowing how to compare fractions helps you get the biggest slice!
In this lesson, we will learn different strategies to figure out if a fraction is bigger, smaller, or equal to another fraction. This is a very im...
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Key Concepts & Vocabulary
TermDefinitionExample
FractionA number that represents a part of a whole or a part of a group.1/4 means 1 part out of 4 equal parts.
NumeratorThe top number in a fraction. It tells you how many parts you have.In the fraction 3/5, the numerator is 3.
DenominatorThe bottom number in a fraction. It tells you how many equal parts the whole is divided into.In the fraction 3/5, the denominator is 5.
Equivalent FractionsFractions that have different numerators and denominators but represent the same value or amount.1/2 is equivalent to 2/4 and 4/8.
Common DenominatorA shared multiple of the denominators of two or more fractions. We use it to compare fractions with different denominators.A common denominator for 1/2 and 1/3 is 6, because both 2 and 3 can multiply to get 6.
Benchmark FractionA com...
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Core Formulas
Rule 1: Same Denominators
If c is the same, compare a and b. If a > b, then a/c > b/c.
When the bottom numbers (denominators) are the same, the fraction with the bigger top number (numerator) is the greater fraction. You have more pieces of the same size.
Rule 2: Same Numerators
If a is the same, compare b and c. If b < c, then a/b > a/c.
When the top numbers (numerators) are the same, the fraction with the smaller denominator is greater. The pieces are bigger because the whole was cut into fewer parts.
Rule 3: Cross-Multiplication
To compare a/b and c/d, calculate a*d and b*c. If a*d > b*c, then a/b > c/d.
This is a quick way to compare any two fractions. Multiply the numerator of the first fraction by the denominator of the second, and vice-versa....
4 more steps in this tutorial
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Challenging
Which symbol makes the statement 4/7 ___ 5/9 true, and why?
A.> because 4 x 9 is greater than 7 x 5
B.< because 7 and 9 are bigger numbers
C.= because the numerators and denominators are close
D.> because pieces that are 1/7th are bigger than pieces that are 1/9th
Challenging
If you have two fractions with the same numerator (like 4), and the first fraction (4/d) is BIGGER than the second fraction (4/f), what does that tell you about their denominators?
A.The first denominator (d) must be bigger.
B.The second denominator (f) must be bigger.
C.The denominators must be equal.
D.The numerators must be different.
Challenging
Find a fraction that is greater than 3/5 but less than 3/4.
A.1/2
B.4/5
C.13/20
D.11/20
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