Ratioz
There are 6 cats and 9 dogs.
Write the ratio of cats to dogs in simplest form.
2:3
Are 2 : 3 and 4 : 6 equivalent?
yes
3 → 5
6 → ___
9 → ___
10, 15
4 notebooks for $8.
What is the cost per notebook?
$2 per notebook
The ratio of boys to girls is 3 : 4.
There are 28 students. How many boys?
12 boys
A class has 12 boys and 18 girls.
Write the ratio of boys to total students in simplest form.
2:5
Are 5 : 8 and 15 : 24 equivalent?
yes
| 4 | 7 |
| 8 | ___ |
| 12 | ___ |
14, 21
9 pencils for $6.
What is the cost per pencil?
$0.67 per pencil (≈ 2/3)
The ratio of gold to silver medals is 2 : 5.
There are 63 medals total. How many are gold?
18 gold medals
There are 5 red, 8 blue, and 7 green marbles.
Write the ratio of red to total marbles.
5:20 = 1:4
Are 6 : 9 and 12 : 15 equivalent? Explain.
no
| 2 | 3 |
| 4 | 6 |
| 6 | ___ |
| ___ | 15 |
9, 10
Which is the better deal?
6 granola bars for $4
or
10 granola bars for $7
10 for $7 is better
The ratio of sunny to rainy days is 4 : 1.
If there were 35 days total, how many were sunny?
28 sunny days
The ratio of apples to oranges is 4 : 6.
Write the equivalent simplified ratio and explain how you know it is equivalent.
2:3
Find two different equivalent ratios to 7 : 9.
14:18 and 21:27 (many possible)
The ratio of boys to girls is 5 : 8.
Complete a ratio table with 4 rows including totals.
5:8 → 10:16 → 15:24 → 20:32
Juice A: 4 cups concentrate for 9 cups water
Juice B: 6 cups concentrate for 15 cups water
Which is stronger? Explain.
Juice A is stronger
The ratio of red to blue balloons is 2 : 3.
Someone says there must be exactly 5 balloons.
Explain why that is incorrect.
Total must be a multiple of 5
A student says 3 : 4 and 4 : 3 are equivalent because they use the same numbers.
Explain why that is incorrect.
Not equivalent because order changes meaning
Create a ratio equivalent to 4 : 11 that has a total of 75 parts. Explain your reasoning.
20:55
The ratio of red to blue is 3 : 5.
Fill a table until the difference between red and blue is greater than 20.
49 red, 70 blue (difference 21)
A car travels 180 miles in 3 hours.
Another travels 300 miles in 5 hours.
Are they traveling at the same speed? Prove it.
Same speed (60 mph)
The ratio of cats to dogs is 3 : 7.
There are 120 animals.
How many more dogs than cats are there?
Explain every step.
60 more dogs than cats