Question

Choose the incorrect step in the given calculation:

• A. Step C
• B. Step D
• C. Step A
• D. Step B

Answer 1

The correct option is B Step D

To find the incorrect step, we perform the calculation correctly using models.

$\text{Rewriting}1\frac{7}{12}\text{, we get:}$


∴ $1\frac{7}{12}+\frac{4}{3}=\frac{19}{12}+\frac{4}{3}⟹StepA$

$\text{Rewriting}\frac{4}{3}\text{, we get:}$


$\therefore \frac{19}{12}+\frac{4}{3}=\frac{19}{12}+\frac{16}{12}⟹StepB$

$\text{Now, calculating}\frac{19}{12}+\frac{16}{12}\text{, we get:}$


∴ $\frac{19}{12}+\frac{16}{12}=\frac{35}{12}⟹StepC$

$\text{Now,}\frac{35}{12}\text{can be written as:}$


∴ $\frac{35}{12}=2\frac{11}{12}⟹StepD$

Comparing the correct steps to the steps given, we find:


$\therefore$ The incorrect step is step D.