Question # To find: The exact circumference of the circle with radius 7 meters and approximate the circumference.

Decimals
ANSWERED To find:
The exact circumference of the circle with radius 7 meters and approximate the circumference. 2021-02-10
Definition:
Multiplying the decimals as through they are whole numbers.
The decimals point in the product is placed so that the number of decimal places in the product is equal to the sum of the number decimal places in the factors.
Radius of the circle is half the diameter of the circle.
Circumference of the circle is $$\displaystyle{2}\pi{r}$$
The value of $$\displaystyle\pi{r}$$ is 3.14
Calculation:
Radius, $$\displaystyle{r}={7}$$ meters
Circumference of the circle is $$\displaystyle{2}\pi{r}$$
Change $$\displaystyle{r}={7}$$ and $$\displaystyle\pi={3.14}\in{2}\pi{r}$$
$$\displaystyle{2}{\left({3.14}\right)}{\left({7}\right)}$$
$$\displaystyle{14}\cdot{3.14}$$
Based on the definition,
Multiply the decimals as through they are whole numbers.
$$\displaystyle{14}\cdot{314}={4396}$$
The decimals point in the product is placed so that the number of decimal places in the product is equal to the sum of the number decimal places in the factors.
The number decimal places in the factors is 2.
So, place decimal point from two number from right.
43.96
On rounding off,
43.96 is taken as 44
Answer: Circumference of the circle is 44 meters