WEBVTT
00:00:03.240 --> 00:00:08.320
3.005 plus 6.12 equals what?
00:00:10.480 --> 00:00:15.760
To help us add these two numbers mentally, we can change the order in which we add.
00:00:17.480 --> 00:00:24.680
We start at 6.12 and add 3.005.
00:00:26.480 --> 00:00:33.840
The three digit in 3.005 represents three ones.
00:00:33.840 --> 00:00:38.360
6.12 plus three is 9.12.
00:00:40.000 --> 00:00:43.520
We’ve just added three to the ones digit.
00:00:45.280 --> 00:00:50.120
There are no tenths to add and no hundredths to add.
00:00:51.680 --> 00:01:01.800
We just need to add five thousandths to 9.12, which takes us to 9.125.
00:01:03.880 --> 00:01:06.960
We could also add these two numbers using column addition.
00:01:08.360 --> 00:01:11.120
We just have a five in the thousandths column.
00:01:12.200 --> 00:01:17.880
Two hundredths and no hundredths gives us a total of two hundredths.
00:01:19.880 --> 00:01:24.840
One tenth and no tenths give us a total of one tenth.
00:01:25.840 --> 00:01:28.080
We need to remember to write the decimal point.
00:01:29.040 --> 00:01:33.440
Then we can add the six and the three ones which makes nine.
00:01:34.880 --> 00:01:41.320
3.005 plus 6.12 equals 9.125.