ungefähr
approximately
Not exact, but only estimated or approximate.
Die Reparatur wird ungefähr 200 Euro kosten.
The repair will cost approximately 200 euros.

approximately
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approximately
Not exact, but only estimated or approximate.
Die Reparatur wird ungefähr 200 Euro kosten.
The repair will cost approximately 200 euros.

The adverb 'ungefähr' (approximately) normally stands directly before the number, quantity, or time expression that it makes inexact.
Ich bin in ungefähr zehn Minuten bei dir.
I'll be with you in approximately ten minutes.
The expression 'von ungefähr' (by chance) is almost always negated: 'nicht von ungefähr kommen' (not to come by chance). This means that something has a good reason and is not a coincidence.
Ihre Beförderung kommt nicht von ungefähr; sie hat sehr hart gearbeitet.
Her promotion didn't come by chance; she worked very hard.
The word is made up of 'un-' and 'Gefahr' (danger). Although today it means 'geschätzt' (estimated), the original idea was 'without danger.' This origin helps explain why it refers to an estimate that is considered safe or plausible.
Ich weiß nicht genau, wie viele Leute kommen, aber es werden ungefähr fünfzig sein.
I don't know exactly how many people are coming, but it will be approximately fifty.
at / around / in order to
'um' and 'ungefähr' can both express that a time, amount, or number is not completely exact. 'um' usually comes directly before a time or number, for example 'um zehn Uhr' (around ten o'clock) or 'um die 50 Euro' (around 50 euros). 'ungefähr' is more flexible and can come before numbers and amounts, or be used in whole statements. In many everyday situations, both mean almost the same thing. However, 'ungefähr' sounds clearer when you want to say in general that something is only estimated.

Wir brauchen ungefähr eine Stunde bis zu meinen Eltern.
We need about an hour to get to my parents' place.
Die Reparatur kostet um die 80 Euro.
The repair costs around 80 euros.