4-3a equivalent ratios
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4-3A EQUIVALENT RATIOS. LD 2011. EQUIVALENT. What does this mean to you? Equal? The same? Interchangeable?. Which fraction does not belong?. Why?. Three of these fractions are equivalent. . They are all equal to . Two bakeries are selling rolls. Are their rates equivalent?. - PowerPoint PPT PresentationTRANSCRIPT
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4-3A EQUIVALENT RATIOS
LD 2011
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EQUIVALENTWhat does this mean to you?
Equal?The same?Interchangeable?
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Which fraction does not belong?
𝟐𝟕
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Why?
𝟐𝟕
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Three of these fractions are equivalent.
They are all equal to
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Two bakeries are selling rolls. Are their rates equivalent?
20 rolls for $548 rolls for $12
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Two bakeries are selling rolls. Are their rates equivalent?
20 rolls for $548 rolls for $12
Yes, they both sell 4 rolls for $1
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The PE depts of two schools are compared. Are these rates equivalent??
42 students on 7 teams
64 students on 8 teams
No. They do not have the same unit rate
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The Pizza Palace sells 3 medium pizzas for $18. The Pizza Factory advertises 5 medium for $30.
Who has the better deal? They are the
same. They are both selling 1 pizza for $6.
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Another way to determine if two ratios are equivalent is to use the CRISS-CROSS method.
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Are these equivalent?5 packs of baseball cards for $15
10 packs of baseball cards for $30
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Write the ratios as fractions:
?
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The question mark indicates that you do not yet know if they are equivalent or not:
?
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Now do the CRISS-CROSS:
?
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5 X 30 = 150
?
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5 X 30 = 15015 X 10 = 150
?
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5 X 30 = 15015 X 10 = 150Since the CRISS equals the CROSS, these ratios are equivalent.
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Are these equivalent?12 girls out of 16 students.
4 girls out of 8 students.
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Write the ratios as fractions:
?
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Now do the CRISS-CROSS:
?
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12 x 8 = 96
?
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12 x 8 = 9616 x 4 = 64
?
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12 x 8 = 9616 x 4 = 64Since the CRISS does NOT equal the CROSS, the ratios are NOT equivalent.
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Open your text to p.225.
Answer problems #1-5.
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Check Your Answers1)No, Not equivalent2) Yes, Equivalent3) Yes, Equivalent4) No, Not Equivalent5) No, Not Equivalent