Elizabeth is making model
birds. To make four birds, she uses 48
feathers. How many feathers does she need for
one bird, and how many feathers does she need to make 11 birds?
We read that to make four birds you
need 48 feathers. And if that’s true, how many
feathers would we need to make one bird? We can use equivalent fractions to
solve this problem. To get from four to one, you divide
by four. If we want equivalent fractions,
we’ll need to do the same thing in the numerator that we did in the denominator. 48 divided by four equals 12.
For every one bird, we need 12
feathers. And how many feathers would we need
for 11 birds? We can make another equivalent
fraction: 11 birds equals how many feathers. Moving from one bird to 11 birds is
multiplying by 11, one times 11. To find out how many feathers 11
birds would need, we would multiply 12 times 11.
We know that 12 times 11 is
132. 11 birds need 132 feathers. One bird needs 12 feathers, and 11
birds would need 132 feathers.