1.7 - 0.8 = 0.9
The given arithmetic expression is:
1.7 - 0.8
Convert 1.7 to a fraction
1.7 = 17/10
Convert 0.8 to a fraction
0.8 = 8/10
Therefore, 1.7 - 0.8 can be expressed as:
17/10 - 8/10 = 9/10
Convert 9/10 back to decimal
9/10 = 0.9
Therefore, 1.7 - 0.8 = 0.9
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