ok, try binary first then. There are only two possible values: 1 and 0. All you need to know is that 0+0=0, 0+1=1, and 1+1=10 (NOT ten, but One Zero) It's very important that you keep in mind that if you see 1000 in binary it's 'One Zero Zero Zero'.
so you'd count like this:
00 (0 decimal)
01 (1) ------ when I added 1 to 00 I got 01, (0+1=1)
10 (2) ------ when I added 1 to 01 I got 10, (1+1=10)
11 (3) ------ when I added 1 to 10 I got 11, (0+1=1)
100 (4) ------ when I added 1 to 11 I got 100, (1+1=10)
The last example maybe needs a bit more explaining. Taking the problem one digit at a time:
we added "1" to the first digit in "11". 1+1=10.
Now we have "0" where the first "1" used to be, and the "1" from our "10" answer is in the same place as the second "1" in "11" e.g. 1(1-on-top-of-other-1)0
With the two 1's in the same place, they need to be added. 1+1=10
So our final answer is 'OneZeroZero' or '100'
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