WEBVTT
00:00:01.161 --> 00:00:05.301
A can contains 375 milliliters of soda.
00:00:05.701 --> 00:00:09.731
How much is left after 308 milliliters is removed?
00:00:10.171 --> 00:00:17.011
This exercise involves combining two numbers and keeping track of the significant figures involved for our answer.
00:00:17.321 --> 00:00:22.041
We’re told that we start with 375 milliliters of soda in a can.
00:00:22.281 --> 00:00:25.511
We then remove 308 of those milliliters.
00:00:25.511 --> 00:00:27.511
And we want to know how much is leftover.
00:00:27.901 --> 00:00:35.511
What we’re doing is combining two numbers through subtraction, that each have three significant figures in them.
00:00:35.871 --> 00:00:41.101
If we perform the subtraction directly, we get a result of 67 milliliters.
00:00:41.401 --> 00:00:49.111
But the question is, since each of the numbers we added together has three significant figures, does our answer need to have three as well?
00:00:49.391 --> 00:00:54.811
In other words, would we report 67.0 milliliters as our result?
00:00:55.191 --> 00:01:07.171
We can recall the rule that when we’re adding or subtracting numbers, the way to keep track of significant figures, is to round our answer to the least number of decimal places involved.
00:01:07.761 --> 00:01:11.891
The two numbers we’re working with, both have zero decimal places.
00:01:12.111 --> 00:01:14.581
So, our final answer will as well.
00:01:14.951 --> 00:01:18.981
The amount of soda leftover is 67 milliliters.