The answer depends on what you wish to change it to!
7.54
times by the little number like .420 is 80
Any kind of fraction becomes decimal notation if you divide the denominator into the numerator. Any decimal notation becomes a percent if you multiply it by 100.
The number IS in decimal notation!
3.88 is decimal notation.
0.536 notation decimal
42.4 as decimal notation = 42.4
It is already in decimal notation as 4.8
0.05 is already in decimal notation.
decimal notation of 335 = 335.0
300 is already in decimal notation.
decimal notation of 3.159 = 3.159