Scale Drawings
What is a scale drawing?
A scale drawing is a scaled representation of an object
Which two of the four operations do we use when finding proportional relationships?
Multiplication and Division
Tony ordered 2 burritos for $10. How much is each burrito?
($5)
What is an equivalent ratio and give an example?
Ratios with the same proportion.
Example varies
Is 2,379 evenly divisible by 2?
No, it is an odd number.
Draw a picture of a box with the scale of 1cm =2 inches
First image is a 1cm square all around
Second box should be 2cm all around
Describe 2 ways you can represent a proportion or ratio.
Multiple answer - as a fraction , using a colon (:) , using a table/chart, number 1 “to” number 2
If you can make 7 bracelets in one hour, how many bracelets could you make in 3 hours?
(21)
The ratios 5:3 and 10:6 are equivalent ratios. Is the ratio 15:12 equivalent to these? Explain your reasoning.
15:12 is not equivalent to 5:3 because 15 is 5 x 3 but 12 is 3 x 4.
What is 25 * 9?
225
scale drawings are always drawn in 2D or 3D?
2D, 2 dimensional
If the first number in a proportion is multiplied by 3 to get an equivalent proportion, what should the second number in the proportion be multiplied by to get the second number in the equivalent proportion?
It should be multiplied by 3
If you can solve 33 puzzles in 3 hours, how many can you solve in one hour?
(11)
A caterer needs to buy 21 pounds of pasta to cater a wedding. At a local store, 8 pounds of pasta cost $12. How can we write a ratio for the given information about the cost of pasta.
Multiple answers- $12 for every 8 pounds; $12 to 8 pounds; 8 pounds to $12
What is 18.45 + ½?
18.95
What does a Scale show us?
A scale communicates the relationship between lengths on a drawing and corresponding lengths in the objects they represent
What is the constant of proportionality between the proportions 12/3 and 6/1.5?
The constant of proportionality is 2
At a restaurant, you can buy 5 hamburgers for $35. What is the unit price?
$7
Elton is a candle maker. Each 15cm long candle he makes burns evenly for 6 hours. If Elton makes a 45cm long candle, how long would it take to burn.
18 hours
A slab of concrete, 25 square feet big, needs to be made smaller. If the job needs pieces to be 5 square feet, how many pieces can come from this slab of concrete?
5 pieces
What are distances referred to on a scale drawings?
Scaled Distances
Find 3 proportions that are equivalent to 1:13
Multiple answers - 2:26 , 3:39 , 4:52
Someone makes 42 origami cranes in 6 hours. What is the unit rate?
7 cranes per hour
Nell’s mom makes chocolate milk with 30mL of chocolate syrup for every 3 ounces of milk. Nells dad adds 65mL of chocolate syrup for every 5 ounces of milk. Who’s milk is more chocolatey?
Nell's mom
What is [(2+4) * 3] / 6?
3