Question

1. multiply: (+2.1) × (+0.012)

Explanation:

Step1: Drop positive signs

$2.1 \times 0.012$

Step2: Multiply as integers

$21 \times 12 = 252$

Step3: Count decimal places

$2.1$ has 1 decimal place, $0.012$ has 3, total 4 places.

Step4: Place decimal point

$\frac{252}{10000} = 0.0252$

Answer:

$0.0252$