Solve Decimal Division: 0.121 ÷ 0.1 Step-by-Step

The task is to divide $0.121$ by $0.1$.

To simplify this calculation, we can eliminate the decimal in the divisor:

• Multiply both the dividend and the divisor by 10:

$0.121 \times 10 = 1.21$

$0.1 \times 10 = 1$

Now we divide $1.21$ by $1$, which simplifies to:

$1.21 \div 1 = 1.21$

Thus, the answer to the division $0.121 \div 0.1$ is $1.21$.

Matching this result with the provided choices, the correct answer is:

• $1.21$, which corresponds to choice 3.

Therefore, the solution to the problem is $1.21$.