9 + 9 + 9/9 + (9 x 9) = 100
(99/99) + 9 = 10 alternative method: 99/9 - 9/9
As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!
Google "Four Fours" and you will find a number of solutions, presented more comprehensively than we can.
How about 4 times 7 is 28 and 8 divded by 2 is 4
9 + 9 + 9/9 + (9 x 9) = 100
99/9=11
9=10
(99/99) + 9 = 10 alternative method: 99/9 - 9/9
9 + 9 + (9/9) = 19
eleven to the power of eleven
5*4+3+2
99 + 9(9 - 9)= 99 + 90 = 99 + 1 = 100
(55 / 55) + (55 / 55) x 5 = 10
As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!
You divide 7 by 4 which is 1.75.
4! - 4 + 4/4