Transcript Ratios

Ratios
11/30/15 – 12/1/15
Vocabulary
• A ratio is a way to compare two numbers.
• When one segment is twice as long as
another, the ratio of the length of the longer
segment to the length of the shorter segment
is “two to one.”
• One way to write “two to one” is 2:1. That
means that for every two units of length on
the longer segment, there is one unit of length
on the shorter segment.
Vocabulary
• Ratios may be written in several ways. Three
ways to express the ratio “two to one” are
• 2 to 1, 2:1, 2
1
1a. What is the ratio of white keys to black keys on the
keyboard?
2a. This pattern of keys is repeated on larger keyboards. How
many black keys would you expect to find on a keyboard
with 42 white keys?
3a. What is the ratio of black keys to all keys on this
keyboard?
1b. What is the ratio of white tiles to purple tiles in
this pattern?
2b. The entire kitchen floor contains 150 purple
tiles. How many white tiles does it have?
3b. What is the ratio of white tiles to all tiles in this
pattern?
1c.
2c.
3c.
Find the missing numbers. Explain how you
found your answers.
What ratio expresses the relationship between
the top number and the bottom number on each
card?
Draw three more cards that belong in this set.