Question

multiply. $square = 2.13 \times 0.197$

Explanation:

Step1: Convert to integers

$2.13 \times 100 = 213$, $0.197 \times 1000 = 197$

Step2: Multiply the integers

$213 \times 197 = 213 \times (200 - 3) = 213\times200 - 213\times3 = 42600 - 639 = 41961$

Step3: Adjust decimal places

Total decimal shifts: $100\times1000=100000$, so $\frac{41961}{100000}$

Answer:

$0.41961$