First it adds by 3. Then on 4, 8, 12 it adds by 4. On 5 and 10 it adds by 5. So i guess it is 3, 4, 5.
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8 3/4 - 5 5/6
Subtraction of Fractions.
Steps to take
#1 ; Convert both fractions to improper (top hravy) fractions
#2 ; Calculate a common denominator
#3 ; Convert the numerators to equivalent values.
#4 ; Subtract the numerators
#5 ; place the numerator over the denominator
#6 ; bring to a mixed number.
Hence
#1 ; 8 3/4 - 5 5/6 = 35/4 - 35/6
#2 ; 4 x 6 = 24 .
#3 ; 35 x 6 = 210 & 35 x 4 = 140
#4 ; 210 - 140 = 70
#5 ; 70/24
#6 ; 2 22/24 = 2 11/12 The answer!!!!
NB Depending on how facile your arithmetic is , you should realise that '12' is a common denominator between 4' & '6' . There would be a corresponding reduction in the numerstors. This makes the numbers smaller all round.
NNB For addition of fractions follow the same steps, except at step #4 , where the numerators are added.