Classify 3 81 ,    2 6 4 6   , – 4.0 , , 5 , 10.124124........ as rational or irrational withjustification

3: This is a rational number because it can be expressed as a fraction (3/1).

81: This is also a rational number because it can be expressed as a fraction (81/1).

(2+6) - (4+6): This simplifies to 8 - 10 = -2, which is a rational number because it can be expressed as a fraction (-2/1).

-4.0: This is a rational number because it can be expressed as a fraction (-4/1).

π (Pi): This is an irrational number. It cannot be expressed as a fraction and its decimal representation never ends or repeats.

5: This is a rational number because it can be expressed as a fraction (5/1).

10.124124...: This is a rational number because its decimal representation is repeating. It can be expressed as a fraction.