To divide decimals the partial sums method requires that numbers are separated into individual portions. The separated numbers are then solved in long division until eliminated.
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I think you round it to the nearest whole number...
In the same way as you estimate them for whole numbers.
192. 20% is 1/5th, so you can divide 960 by 5.....or....you can do it the slightly messier way of moving the decimal point 2 places to the left and multiply by 20. Or, you can even do a partial sums method to work with smaller numbers: (20% of 100)*9 + (20% of 60). There are really myriad ways to solve this.
It is a valid sequence which is fundamental to arithmetic since its partial sums define the counting numbers.
Yes.