[Script Info]
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[Events]
Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
Dialogue: 0,0:00:00.36,0:00:04.89,Default,,0000,0000,0000,,We're asked to subtract.\NAnd we have the problem 68 - 42.
Dialogue: 0,0:00:04.89,0:00:09.14,Default,,0000,0000,0000,,And what I want to do here, is \N1) just show you how I would do this problem,
Dialogue: 0,0:00:09.14,0:00:12.52,Default,,0000,0000,0000,,and then, talk a little bit \Nabout why it actually works.
Dialogue: 0,0:00:12.52,0:00:17.53,Default,,0000,0000,0000,,So if I have 68 - 42, one way to do it – \Nand this is probably the most typical way –
Dialogue: 0,0:00:17.53,0:00:20.76,Default,,0000,0000,0000,,is to write the number you're\Nsubtracting from on top,
Dialogue: 0,0:00:20.76,0:00:24.51,Default,,0000,0000,0000,,and to write the number that you're \Nsubtracting from that number below that.
Dialogue: 0,0:00:24.51,0:00:27.12,Default,,0000,0000,0000,,So we're going to have 68 - 42.
Dialogue: 0,0:00:27.12,0:00:30.20,Default,,0000,0000,0000,,And the thing you really want to think\Nabout – or to make sure you do,
Dialogue: 0,0:00:30.20,0:00:32.28,Default,,0000,0000,0000,,is to align your numbers according to place.
Dialogue: 0,0:00:32.28,0:00:35.50,Default,,0000,0000,0000,,So the 2 is below the 8 –\N(They're both in the 1's place.)
Dialogue: 0,0:00:35.50,0:00:38.73,Default,,0000,0000,0000,,– and the 4 is below the 6.\N(They're both in the 10's place.)
Dialogue: 0,0:00:38.73,0:00:41.58,Default,,0000,0000,0000,,And later in this video it should be \Nclear – or I'll hopefully make it clear –
Dialogue: 0,0:00:41.58,0:00:44.14,Default,,0000,0000,0000,,why that's a good thing to do.
Dialogue: 0,0:00:44.14,0:00:47.40,Default,,0000,0000,0000,,Alright. So then we go to \Nthe 1's place, and we see an 8.
Dialogue: 0,0:00:47.40,0:00:49.74,Default,,0000,0000,0000,,And from that, we're\Ngoing to subtract a 2.\N
Dialogue: 0,0:00:49.74,0:00:53.53,Default,,0000,0000,0000,,So, 8 - 2 is 6. (8 - 2 = 6)\NI'll write that over here.
Dialogue: 0,0:00:53.53,0:00:54.79,Default,,0000,0000,0000,,Let me write that over here.
Dialogue: 0,0:00:54.79,0:00:56.36,Default,,0000,0000,0000,,8-2 is 6.
Dialogue: 0,0:00:56.36,0:01:02.20,Default,,0000,0000,0000,,8 - 2 is equal to 6. \N(Repeating: 8 - 2 = 6)
Dialogue: 0,0:01:02.20,0:01:05.60,Default,,0000,0000,0000,,And then we go to the 10's place.\NWe have 6 - 4.
Dialogue: 0,0:01:05.60,0:01:08.67,Default,,0000,0000,0000,,And since they're in the 10's place, \Nthis is really 60 - 40.
Dialogue: 0,0:01:08.67,0:01:15.60,Default,,0000,0000,0000,,But 6 - 4 is 2.\N6 - 4 = 2.
Dialogue: 0,0:01:15.60,0:01:19.69,Default,,0000,0000,0000,,And since these are in the 10's place, \Nthis is really saying 60 - 40 = 20.
Dialogue: 0,0:01:19.72,0:01:21.85,Default,,0000,0000,0000,,And I'll make that a little bit clearer in a second.
Dialogue: 0,0:01:21.85,0:01:22.82,Default,,0000,0000,0000,,So we're actually done here.
Dialogue: 0,0:01:22.82,0:01:26.26,Default,,0000,0000,0000,,68 - 42 = 26.
Dialogue: 0,0:01:26.26,0:01:28.14,Default,,0000,0000,0000,,And you can check that for yourself.
Dialogue: 0,0:01:28.14,0:01:31.47,Default,,0000,0000,0000,,If you add 26 + 42,\Nyou should get 68.
Dialogue: 0,0:01:31.47,0:01:35.96,Default,,0000,0000,0000,,Or if you subtract 26 from 68\Nyou should get 42.
Dialogue: 0,0:01:35.96,0:01:39.00,Default,,0000,0000,0000,,So I encourage you do that in \Nyour own time after this video –
Dialogue: 0,0:01:39.00,0:01:46.18,Default,,0000,0000,0000,,verify that 42 + 26 = 68.
Dialogue: 0,0:01:46.18,0:01:50.87,Default,,0000,0000,0000,,And also verify what 68 - 26 is equal to.
Dialogue: 0,0:01:50.87,0:01:52.70,Default,,0000,0000,0000,,And you should see that is equal to 42.
Dialogue: 0,0:01:52.70,0:01:56.10,Default,,0000,0000,0000,,So these are two things for \Nyou to check on your own.
Dialogue: 0,0:01:56.10,0:01:59.13,Default,,0000,0000,0000,,Now, the last thing I want to do\Nin this video is just to explain
Dialogue: 0,0:01:59.13,0:02:01.67,Default,,0000,0000,0000,,in a little bit more depth why this actually works.
Dialogue: 0,0:02:01.67,0:02:05.40,Default,,0000,0000,0000,,And, at least in my mind, I like to visualize 68 –
Dialogue: 0,0:02:05.40,0:02:07.02,Default,,0000,0000,0000,,(You won't to have write it out like this –
Dialogue: 0,0:02:07.02,0:02:09.35,Default,,0000,0000,0000,,but it's one way to make sure you\Nreally understand what is going on here.)
Dialogue: 0,0:02:09.35,0:02:15.32,Default,,0000,0000,0000,,68 is the same thing as 60 + 8, or 60 and 8.
Dialogue: 0,0:02:15.32,0:02:17.72,Default,,0000,0000,0000,,And from that, we're subtracting 42.
Dialogue: 0,0:02:17.72,0:02:21.35,Default,,0000,0000,0000,,But 42 is the same thing as 40 + 2.
Dialogue: 0,0:02:21.36,0:02:25.77,Default,,0000,0000,0000,,So we're subtracting 40,\Nand we're subtracting 2.
Dialogue: 0,0:02:25.77,0:02:29.20,Default,,0000,0000,0000,,We're subtracting 42.\NWe're subtracting 40 and 2.
Dialogue: 0,0:02:29.20,0:02:32.19,Default,,0000,0000,0000,,And so you can view this as \Nreally two separate problems.
Dialogue: 0,0:02:32.19,0:02:35.42,Default,,0000,0000,0000,,You have, in the 1's place, you have 8 - 2.
Dialogue: 0,0:02:35.42,0:02:38.20,Default,,0000,0000,0000,,And that is exactly what we did over here.\NYou have a 6.
Dialogue: 0,0:02:38.20,0:02:44.27,Default,,0000,0000,0000,,And then in 10's place,\Nyou have 60 - 40, which is 20.
Dialogue: 0,0:02:44.27,0:02:46.87,Default,,0000,0000,0000,,So you end up with 20 + 6.
Dialogue: 0,0:02:46.87,0:02:53.10,Default,,0000,0000,0000,,and you know that that is \Nthe same exact thing as 26.