Question

50 x 80 = 50 x (8x10)
= (50 x8) x10
=?x10
=4,000

Answer 1

400 is the answer to your question hope it helps

Answer 2

The missing number there would be 400.

The ? is filling in the spot where the (50 x 8) was in the previous step, and 50 x 8 = 400.