Determining Proportions
Pre-Algebra · Flashcards
PRE-ALGEBRA · FLASHCARDS
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QUESTION
What unit price shows that 6 pens for 3 dollars and 10 pens for 5 dollars are proportional?
QUESTION
What is a proportion?
QUESTION
Using cross products, explain why
5
8
\frac{5}{8}
8
5
and
15
25
\frac{15}{25}
25
15
do not form a proportion.
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ANSWER
5
⋅
25
=
125
5 \cdot 25 = 125
5
⋅
25
=
125
but
8
⋅
15
=
120
8 \cdot 15 = 120
8
⋅
15
=
120
. Unequal cross products mean the ratios are not equal.
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