4-3A EQUIVALENT RATIOS

4-3A EQUIVALENT RATIOS

LD 2011

EQUIVALENTWhat does this mean to you?

Equal?The same?Interchangeable?

Which fraction does not belong?

𝟐𝟕

Why?

𝟐𝟕

Three of these fractions are equivalent.

They are all equal to

Two bakeries are selling rolls. Are their rates equivalent?

20 rolls for $548 rolls for $12

Two bakeries are selling rolls. Are their rates equivalent?

20 rolls for $548 rolls for $12

Yes, they both sell 4 rolls for $1

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

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.

Another way to determine if two ratios are equivalent is to use the CRISS-CROSS method.

Are these equivalent?5 packs of baseball cards for $15

10 packs of baseball cards for $30

Write the ratios as fractions:

?

The question mark indicates that you do not yet know if they are equivalent or not:

?

Now do the CRISS-CROSS:

?

5 X 30 = 150

?

5 X 30 = 15015 X 10 = 150

?

5 X 30 = 15015 X 10 = 150Since the CRISS equals the CROSS, these ratios are equivalent.

Are these equivalent?12 girls out of 16 students.

4 girls out of 8 students.

Write the ratios as fractions:

?

Now do the CRISS-CROSS:

?

12 x 8 = 96

?

12 x 8 = 9616 x 4 = 64

?

12 x 8 = 9616 x 4 = 64Since the CRISS does NOT equal the CROSS, the ratios are NOT equivalent.

Open your text to p.225.

Answer problems #1-5.

Check Your Answers1)No, Not equivalent2) Yes, Equivalent3) Yes, Equivalent4) No, Not Equivalent5) No, Not Equivalent