Change the whole number into an improper fraction with the same denominator as the fraction and then subtract accordingly
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You convert the mixed numeral into an improper fraction. Now subtract the improper fraction from the whole number by putting the whole number over 1.
No.
The recommended method in schools is to write the whole number as a rational fraction with denominator 1, and then proceed as you would for subtracting one fraction from another fraction.
It means how many times you can subtract the whole number from the fraction before you reach zero. Assuming you've not got a mixed fraction, the whole number will only be able to be subtracted a fractional number of times.
Yes, you can but you need to "rename" the whole part of the first mixed number.