Equivalent Ratios
True or false: 1:2 is equivalent to 2:4
True. Both 1 and 2 are multiplied by the same number (2)
I have 3 red markers to 12 blue markers. What is the unit rate of red to blue?
a. 1 to 4
b. 4 to 1
c. 12 to 3
1 to 4
What two things does the double number line anchor chart compare? What is the top number line counting by? What about the bottom one?
pizzas and hours
If Ms Sheri can grade 6 exit tickets in 10 minutes, how many exit tickets can she grade in 30 minutes?
36 exit tickets
Who is faster?
Lola: 120 miles in 5 hours
Bugs: 124 miles in 6 hours
Daffy Duck: 80 miles in 4 hours
Michael Jordan: 90 miles in 3 hours
Michael Jordan is faster
What diagrams can we use to find equivalent ratios?
tape diagram, double number line, ratio table, discrete model
I use 4 cups of sugar to make 2 batches of cookies. How many batches can I make with 28 cups of sugar ?
14 batches
Im reading 60 words per minute
Which table shows 60 words per minute
(On board)
Table A
A unit rate is always compared to what number?
1
For every 3 red apples there is 1 green apple in a crate. If there are 24 apples total how many green apples will there be? Use a discrete model
6 green apples
Which store has the cheapest almonds per pound? What is the unit rate of each?
Costco: 8 pounds for $12
Whole Foods: 3 pounds for $3.50
Safeway: 7 pounds for $8
Safeway is cheaper
What is the equation for finding price per unit?
price/# of units
Ms. P is making copies. The copy machine can run copies at a rate of 20 copies per minute. How long will it take the machine if Ms.P needs 80 copies?
4 minutes
If I want to double a ratio how many tape diagram copies should I have?
two tape diagrams!