Solve the following exercise:
42−61=?
To solve this problem, we will follow these steps:
- Step 1: Simplify the initial fraction 42.
- Step 2: Find a common denominator for 21 and 61.
- Step 3: Convert the fractions to have the common denominator.
- Step 4: Subtract the fractions.
- Step 5: Simplify the resulting fraction.
Let's work through these steps:
Step 1: Simplify 42=21.
Step 2: Identify the least common denominator (LCD) for 21 and 61. The denominators are 2 and 6, and the LCM of 2 and 6 is 6.
Step 3: Convert both fractions to have this common denominator.
21=2×31×3=63
61=61 (already with the correct denominator).
Step 4: Subtract the fractions:
63−61=63−1=62.
Step 5: Simplify the resulting fraction 62. Find the greatest common divisor (GCD) of 2 and 6, which is 2, and divide both numerator and denominator by 2:
62=6÷22÷2=31.
Therefore, the solution to the problem is 31.