Question

1. how can i reason about the sum of two fractions with like denominators?2. to reason about the sum, i can compare the sum of the numerators to the denominator.3. complete the equation to make 1.$\frac{3}{10} + \frac{square}{10} = 1$

Explanation:

Step1: Rewrite 1 as fraction

$1 = \frac{10}{10}$

Step2: Isolate unknown numerator

Let $x$ be the unknown numerator.
$\frac{x}{10} = \frac{10}{10} - \frac{3}{10}$

Step3: Subtract numerators

$\frac{x}{10} = \frac{10-3}{10} = \frac{7}{10}$

Answer:

7