We reviewed ratio and proportions

Ratio: A comparison of two numbers

Proportion: A statement where 2 ratios are equal


4/5 = 8/10

So you can cross multiply   4 x 10 = 5 x 8

  Complete the hand out below

Mark yes or no for each pair or ratios below based on whether they are proportional. The first two are done for you.
1 : 2   and   2 : 4 Proportional?  yes	1 : 4   and   2 : 7 Proportional?   no	2 : 6   and   1 : 3 Proportional?
4 : 5   and   8 : 12 Proportional?	3 : 4   and   7 : 12 Proportional?	5 : 6   and   10 : 12 Proportional?
7 : 10   and   21 : 30 Proportional?	10 : 2   and   6 : 1 Proportional?	3 : 9   and   9 : 27 Proportional?
Answer yes or no to the questions below based on whether the prices are directly proportional.
1 can of juice for $2.00 and 4 cans for $6.
5 liters of paint for $12 and 10 liters for $24
75g of chocolate for $1.50 and 150g for $3.00
3 pairs of socks for $3.00 and 10 pairs for $8.00
20 pencils for $2.00 and 50 pencils for $4.00