WEBVTT
00:00:01.440 --> 00:00:04.820
Write the answer to the calculation in grams.
00:00:05.780 --> 00:00:09.260
46 kilograms plus 72 grams.
00:00:10.790 --> 00:00:15.240
Here we’ve got two two-digit numbers, 46 and 72.
00:00:16.080 --> 00:00:19.100
So, shall we just add these two numbers together to find the answer?
00:00:20.680 --> 00:00:23.460
No, we need to look more closely at the question.
00:00:24.370 --> 00:00:30.800
The two measurements are measurements of mass, but they’re both given in different units of measurement.
00:00:31.500 --> 00:00:36.360
46 kilograms plus 72 grams.
00:00:37.080 --> 00:00:40.570
And, we’re told to write the answers to the calculation in grams.
00:00:41.290 --> 00:00:44.650
So, we can’t just add 46 and 72 together.
00:00:44.650 --> 00:00:45.910
That would be a mistake.
00:00:46.560 --> 00:00:52.670
Instead, we need to convert one of the measurements, so that they’re both in the same unit of measurement.
00:00:53.320 --> 00:00:59.970
Cause we’re asked for the answer to the calculation in grams, then let’s convert both measurements into grams.
00:01:00.540 --> 00:01:05.040
We can see that the second measurement is already in grams, so we don’t need to worry about that one.
00:01:05.850 --> 00:01:08.830
But, 46 is in measurement of kilograms.
00:01:09.210 --> 00:01:13.200
So, we need to convert this into grams before we add the two together.
00:01:14.060 --> 00:01:16.560
What do we know about kilograms and grams?
00:01:17.280 --> 00:01:21.090
Well, one kilogram is worth 1000 grams.
00:01:21.700 --> 00:01:27.760
And so, to convert kilograms into grams, we multiply by 1000.
00:01:28.560 --> 00:01:37.210
This is quite straightforward to do when we’re multiplying a number like 46 because if we multiply 46 by 1000, we get that number of thousands.
00:01:38.160 --> 00:01:43.320
46 times 1000 equals 46000.
00:01:45.270 --> 00:01:50.990
So, we can say 46 kilograms is the same as 46000 grams.
00:01:51.960 --> 00:01:54.160
Now, both our measurements are in grams.
00:01:54.430 --> 00:01:55.520
We can add them together.
00:01:55.520 --> 00:01:57.740
And, the answer will also be in grams.
00:01:58.600 --> 00:02:01.550
46000 plus 72.
00:02:02.420 --> 00:02:08.110
Well, we can see there are two zeros in the tens and the units places of 46000.
00:02:08.390 --> 00:02:15.190
So, if we add 72 to 46000, the seven and the two digits will just fit into the number.
00:02:16.050 --> 00:02:23.230
46000 plus 72 equals 46072.
00:02:24.010 --> 00:02:30.780
We realized that in order to add these two measurements together, they had to both be in the same unit of measurement.
00:02:31.390 --> 00:02:39.390
And, because the question asked us to give our answer in grams, we knew we had to convert 46 kilograms into grams.
00:02:39.890 --> 00:02:42.530
We couldn’t just add 46 and 72 together.
00:02:43.560 --> 00:02:48.050
46 kilograms we found was 46000 grams.
00:02:48.910 --> 00:02:53.570
46000 plus 72 equals 46072.
00:02:54.520 --> 00:03:02.650
And so, 46 kilograms plus 72 grams equals 46072 grams.