Find the LCD to add and subtract fractions

When we add or subtract fractions that have different denominators, the least common denominator is not always obvious

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QUESTION OF
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Views #: 1318
Questions #: 4
Time: 5 minutes
Pass Score: 80.0%
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The Least Common Multiple (LCM)

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The least common multiple (LCM) of two whole numbers is the smallest whole number that is divisible by both of those numbers

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Explanation

Finding the least common denominator

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Choose the right way to find the LCM of the denominators

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Explanation

Add the following fractions and simplify if possible

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$\frac{7}{15} + \frac{3}{10}$

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Subtract and simplify the following two fractions

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$\frac{13}{28} - \frac{1}{21}$

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Explanation

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0
sin cos tan
sin-1 cos-1 tan-1 π e
xy x3 x2 ex 10x
y√x 3√x √x ln log
( ) 1/x % n!
7 8 9 + MS
4 5 6 – M+
1 2 3 × M-
0 . EXP ÷ MR
± RND C = MC
Keywords
Year 5