Question

a)25 x 99 + 25 

Answer 1

\(25\times99+25=2475+25=2500\)

Answer 2

\(25\times99+25\)
\(=25\times99+25\times1\)
\(=25\times\left(99+1\right)\)
\(=25\times100\)
\(=2500\)

Answer 3

2500

Answer 4

\(25\) x \(99\) \(+\) \(25\) \(=\) \(\text{2475 + 25 = 2500}\)