Find common denominator: Find a common denominator for the fractions43 and 21. The least common denominator (LCD) between 4 and 2 is 4. Convert 21 to a fraction with denominator 4: 21=42.
Convert fractions: Add the fractions 43 and 42. 43+42=45.
Add fractions: Simplify the fraction 45, if possible.45 is already in its simplest form, representing 1 and 41 or 1.25 as a decimal.
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