WEBVTT
00:00:01.180 --> 00:00:06.260
Calculate 70.75 plus 78.9.
00:00:06.260 --> 00:00:13.230
We can take these two values and line them up vertically.
00:00:14.540 --> 00:00:16.520
They would look something like this.
00:00:17.480 --> 00:00:21.590
It’s really important here that we keep the place values lined up.
00:00:21.990 --> 00:00:25.650
And we can do that by making sure that the decimal points are in line.
00:00:27.060 --> 00:00:30.180
After everything is lined up correctly, we’re ready to add.
00:00:31.370 --> 00:00:35.860
70.75 has a five in the hundredths place.
00:00:36.210 --> 00:00:42.060
78.9 doesn’t have anything in the hundredths place.
00:00:42.850 --> 00:00:46.910
So we say five plus zero equals five.
00:00:48.030 --> 00:00:50.480
And then, we move on to the tenths place.
00:00:50.800 --> 00:00:55.780
Seven tenths plus nine tenths equals 16 tenths.
00:00:56.370 --> 00:01:01.170
We can write that as six tenths and one whole.
00:01:02.570 --> 00:01:07.680
After that we bring down our decimal place and then add the ones place.
00:01:07.720 --> 00:01:12.390
One plus zero plus eight equals nine.
00:01:13.430 --> 00:01:17.050
Seven plus seven equals 14.
00:01:18.490 --> 00:01:23.280
The sum is 149.65.
00:01:24.220 --> 00:01:33.220
70.75 plus 78.90 equals 149.65.