Give a rough estimate (by rounding off to nearest hundreds) and also a closer estimate (by rounding off to nearest tens)of the following 439+334+4317?

a)

400+300+4300=5000

b)
440+330+4320=5090

How do you round 0.23 to the nearest whole number?

We check which whole number 0.23 is closest to: 
 


 

the shorter distance is from 0 

so we round to 0 



:)