What is the result of the division 0.399÷0.21?

To find the result of the division 0.399 ÷ 0.21, you need to perform the division operation correctly.

First, you can simplify the division to avoid dealing with decimals directly. One effective method is to convert both numbers into whole numbers by multiplying them by 1000, which allows for easier calculation:

0.399 becomes 399 and 0.21 becomes 21.

Now you can perform the division:

399 ÷ 21 = 19

Now, you take the result and divide by 10 (since you moved the decimal place two digits to the right for 0.21):

19 ÷ 10 = 1.9

Thus, the correct answer to the division 0.399 ÷ 0.21 is indeed 1.9. This procedure shows how to manipulate the decimals efficiently for clear calculations, leading to the conclusion that option B is the correct result.