Infinitely many.
Start with integer addition:
... -5+50, -4+49, -3+48, -2+47, -1+46, 0+45, 1+44, 2+43, ... extending infinitely far in both directions.
Then add numbers to 1 decimal place:
... -5.1+50.1, and so on.
and then numbers to 2 decimal places, 3 dp, and so on, to infinitely many decimal places.
Then consider multiplication and division.
And all that is just for pairs of numbers. You can, of course, extend to triplets and quads, and so on.
the way you make it into a fraction is 45/100
Sure! One way to get 45 is by multiplying 9 by 5. Another way is by adding 20 and 25. A third way is by subtracting 15 from 60.
8
45 with 7 left over 457 - 7 = 450 = 10 x 45
.45
the way you make it into a fraction is 45/100
20*45 = 900
45
Sure! One way to get 45 is by multiplying 9 by 5. Another way is by adding 20 and 25. A third way is by subtracting 15 from 60.
45.
45
It takes four times because 45+45=90+45=135+45=180. So all of those angles can make a straight line.
Number of combinations = 45C6 = 45!/6!(45-6)! = 8,145,060
45
45
there are 45 different types of dogs in Australia
45 is an integer, not a fraction and there is no sensible way to express it as a fraction.