WEBVTT
00:00:00.930 --> 00:00:06.620
Some number minus 104 equals 381.
00:00:06.920 --> 00:00:09.560
Can you find out what the missing number is?
00:00:12.200 --> 00:00:18.060
Let’s imagine that inside this yellow rectangle is our missing value.
00:00:18.270 --> 00:00:20.240
We don’t know how much it is.
00:00:22.110 --> 00:00:28.090
We know that we took 104 away from this value.
00:00:30.070 --> 00:00:37.390
And after we took that 104 away, there was 381 left.
00:00:39.860 --> 00:00:50.450
To find how much was in our box when we started, we need to add what we took away, the pink part, with what was remaining, the blue part.
00:00:51.040 --> 00:00:58.430
If we add 104 plus 381, we will know what we had to start with.
00:01:00.090 --> 00:01:03.950
We can line the two values up vertically and then add.
00:01:05.130 --> 00:01:10.440
Starting in the units position, four plus one equals five.
00:01:11.350 --> 00:01:16.280
In the tens place, we have zero plus eight equals eight.
00:01:17.830 --> 00:01:22.770
In the hundreds place, one plus three equals four.
00:01:24.220 --> 00:01:28.330
The number we started with would have been 485.
00:01:29.730 --> 00:01:36.290
485 minus 104 equals 381.