Question

solve by changing one of numbers to 100 or its multiples 195+25

Answer 1

195+25
= 200 + 25 - 5 ---------------------(as 195 = 200 - 5, 200 is multiple of 100 x 2 )
= (200 + 25) - 5
= 25 (8+1) - 5 
= 25 (9) - 5 
= 225 - 5
= 220
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Or 
195+25
= 195 + (20 + 5)
=(195 + 5) +20
=200 + 20 ---------------------(as 200 is multiple of 100 x 2 )
=20(10+1)
=20x11
=220