Question

If a student multiplies $150$ by $16$ instead of $15$, the difference in the product is

• A. $240$
• B. $16$
• C. $150$
• D. $15$

Answer 1

The correct option is C

$150$

Step 1: Find the increase or decrease in the product when multiplied by $1$.

Let the student multiply $1$ by $16$ instead of $15$

Then the increase would be $=(1\times 16)-(1\times 15)$

$$\begin{gathered} =16-15 \\ =1 \end{gathered}$$

Step 2: Find the actual increase or decrease by using the original number given.

Actual increase $=1\times 150$

$=150$

Therefore the difference in the product will be $150$.