It is 800/200 = 4.
A far better estimate, which is still easy to work out, is based on 840/240 = 84/24. Dividing the numerator and denominator by the GCF of 84 and 24, which is 12, gives 7/2 or 3.5.
The answer is 3.4979 to 4 decimal places.
Yes.
Because that is how a rational number is defined!
You CAN'T divide by zero.
Yes, always. That is the definition of a rational number.
I had this name question for homework :| no
It is front-end estimation.
A non-zero number divided by itself is 1.
Yes, it is.
Yes.
The LCf of any two nonzero whole numbers is one because every nonzero whole number can be divided by it.
The number of s.f or rounding off
Because that is how a rational number is defined!
Because that is how a rational number is defined!
You CAN'T divide by zero.
Yes, always. That is the definition of a rational number.
Yes, by definition.
An estimate is an educated guess based on prior knowledge. Rounding off is knowing the exact value but rounding it to the nearest whole number.