Remembering BODMAS (Brackets, Orders, Division, Multiplication, Addition, Subtraction), we know that 9+9x9-467 will work out as 9+(9x9)-467 because multiplication comes before addition or subtraction.
We then get 9+81-467 which equals to:
9+81-467 = -377
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add 9 add 1 subtract 20 add 9 add 1
9+(-3)=6 6-(-3)=9
(9*9)+9+9+9/9 = 100
If the fractions have the same denominator, just add or subtract the numerators. 13/20 - 9/20 = 4/20 2/5 + 1/5 = 3/5
-4 take the number 1-9 and add 4 and you've got the answer