First, we round 995:
We need to round it up since 995 has a 5 in the ones place and we always round 5-9 up.
995 is about 1000.
Then, we round 51:
51 is closer to 50 than 60.
51 is about 50.
The expression before: 995*51.
Now: 1000*50.
We annex the zeroes and that get us 1*5 = 5. Then, we add back the four zeroes:
1000*50 = 50000
So 995*51 is about 50,000.
