Estimate by rounding each addend to the greatest place: 50,099 + 24,565=74,664.

A is 65,000, B is 75,000, C is 70,000, D is 71,000

I'm not 100% sure what you're asking, but i think it wants:

50,000 + 25,000 = 75,000 - so B is the answer

to do it you basically just round the number to the nearest 1000 and add