1 1/8.
There are usually different ways to solve the same problem. Here's one:
2 7/8 - 1 3/4 = 2 + 7/8 - ( 1 + 3/4) = 2 + 7/8 - 1 - 3/4 = 2 - 1 + 7/8 - 3/4 = 1 + 1/8 = 1 1/8.
Or, 2 7/8 = 23/8 and 1 3/4 = 7/4 = 14/8. So 23/8 - 14/8 = 9/8 = 1 1/8.
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Six eighths, or three fourths.
Three fourths is six eighths. Six eighths minus one eighth is five eighths.
Three eighths minus one fourth is one eighth.
-1/2
seven twenty-fourths