it is half of a half
90
90
6.5% of 90= 6.5% * 90= 0.065 * 90= 5.85
One and a half hour is 90 minutes.
45 is half of 90.
Number of Neutrons = Mass number - atomic number = 90 - 38 = 52
10 x 90 = 900
half 44 = 22
90
15.
9+90=99 (90 is ten times as much as 9)