Answer:
Its easy.
Explanation:
1) 50
2) 60
3) 80
4) 90
5) 30
just have to check the ones placed, and then find out if that number is nearer to the tens placed number or the next number.
For example, if we take 48
So 8 is nearer to the next number not 40 but it is nearer to 50. So, 59 is the answer.
Just like this for all rounding off questions.
Hope it helped!!!