WEBVTT
00:00:00.360 --> 00:00:03.200
Elizabeth is making model birds.
00:00:04.120 --> 00:00:08.760
To make four birds, she uses 48 feathers.
00:00:09.520 --> 00:00:19.000
How many feathers does she need for one bird, and how many feathers does she need to make 11 birds?
00:00:19.920 --> 00:00:25.560
We read that to make four birds you need 48 feathers.
00:00:26.480 --> 00:00:32.880
And if that’s true, how many feathers would we need to make one bird?
00:00:33.760 --> 00:00:37.400
We can use equivalent fractions to solve this problem.
00:00:38.280 --> 00:00:42.280
To get from four to one, you divide by four.
00:00:42.920 --> 00:00:51.000
If we want equivalent fractions, we’ll need to do the same thing in the numerator that we did in the denominator.
00:00:51.840 --> 00:00:55.720
48 divided by four equals 12.
00:00:56.600 --> 00:01:00.960
For every one bird, we need 12 feathers.
00:01:01.680 --> 00:01:05.840
And how many feathers would we need for 11 birds?
00:01:06.960 --> 00:01:13.720
We can make another equivalent fraction: 11 birds equals how many feathers.
00:01:14.560 --> 00:01:22.560
Moving from one bird to 11 birds is multiplying by 11, one times 11.
00:01:23.280 --> 00:01:30.240
To find out how many feathers 11 birds would need, we would multiply 12 times 11.
00:01:30.960 --> 00:01:35.600
We know that 12 times 11 is 132.
00:01:37.400 --> 00:01:43.240
11 birds need 132 feathers.
00:01:44.120 --> 00:01:53.440
One bird needs 12 feathers, and 11 birds would need 132 feathers.