1. 7x2x2.1=15.12

2. 4.3x8.5=36.55

3. 2.64x1.4=3.696

4. 14.23x8.21=116.8283

5. 5.01x11.6=58.116

6. 9.001x4.2
37.8042

Do you have a typo in number 1?

The others are right.

7.2*

Right.

To calculate the product of two numbers, you simply multiply them together. Let's solve the given calculation:

6. 9.001 x 4.2

To multiply decimal numbers, follow these steps:
1. Ignore the decimal points and multiply the numbers as if they were whole numbers.
9001 x 42 = 378,042
2. Count the total number of digits after the decimal points in both numbers.
In this case, there are 4 digits after the decimal point in the first number (9.001) and 1 digit after the decimal point in the second number (4.2). Therefore, there are a total of 5 digits after the decimal point.
3. Place the decimal point in the answer by counting from the right side and placing it after the fifth digit.
37.8042

Therefore, the answer to 9.001 x 4.2 is 37.8042.