Question

The steps for solving $3.9\times 2.4÷$ 4 are given below. At which step has an error occurred?

• A. $2:2.34$
• B. $1:93.6÷4$

Answer 1

The correct option is B $1:93.6÷4$

Since there are two decimal places in total in the multiplicand and the multiplier, the decimal point should be placed before two digits from the right in the product.

$3.9\times 2.4÷4$
$=9.36÷4$
$=2.34$


Hence, Step 1 is incorrect.