-7/10 - 9/10 = -1.6 or -16/10 or -1 and 6/10
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The exact form would be 69/10 (sixty-nine tenths). The decimal form would be 6.9. The mixed number form would be 6 9/10 (six nine-tenths).
Sixty nine and seven tenths as a mixed number = 697/10
Seven and nine tenths.
7 6/10
One hundred minus seven tenths is ninety-nine and three tenths. It is actually a fairly easy problem.