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23 add something equals 100 = 123
117
13 add something equals 30 = 43
The eleventh century. Basically, divide by 100, round down to the nearest digit and add one. 1066 divided by 100 is 10.66, round down to 10, add 1 equals eleven.
200
That would be called Addition.
126
100
It is as simple as doing this on a calculator. 162.16 X 1.1 =178.376. To add 10 % multiply by 1.1. To add 30%, 1.3. 125%, 2.25. See the pattern? The percent divided by 100 plus one.
10
59 + 41 = 100
92.97999999999999