First, find the greatest common factor (GCF) of 210 and 168.
210 = 2 * 3 * 5 * 7
168 = 2 * 2 * 2 * 3 * 7
The GCF is 2 * 3 * 7 = 42.
Now, divide both the numerator and denominator by 42:
210 ÷ 42 = 5
168 ÷ 42 = 4
Therefore, -210/168 reduces to -5/4.
reduce this fraction by factoring and canceling
-210/168
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