Round off the following measurements to two significant figures. Write the answers in scientific notation. a. 6310 m b. 125.00 Kg c. 6906 km d. 0.0828 m need steps and formela

Explanation:

a. 6310 m

Two significant numbers means it must have only 2  digits. The first two digits are 6 and 3. The next number 1 is not up to 5 hence it would be round off to zero.

Two s.f = 6300

Converting it to scientific notation means it must be expressed by a number between 1 and 10, multiplied by a power of 10.

6.3 x 10^3

b. 125.00 Kg

Two significant numbers means it must have only 2  digits. The first two digits are 1 and 2. The next number 5 is up to 5 hence it would be round up to one.

Two s.f = 130.00

Converting it to scientific notation means it must be expressed by a number between 1 and 10, multiplied by a power of 10.

Scientific notation = 1.3 x 10^2

c. 6906 km

Two significant numbers means it must have only 2  digits. The first two digits are 6 and 9. The next number 0 is not up to 5 hence it would be round up to zero.

Two s.f = 6900

Converting it to scientific notation means it must be expressed by a number between 1 and 10, multiplied by a power of 10.

Scientific notation = 6.9 x 10^3

d. 0.0828 m

Two significant numbers means it must have only 2  digits. The first two digits(excluding zero) are 8 and 2 . The next number 8 is up to 5 hence it would be round up to one.

Two s.f = 0.083

Converting it to scientific notation means it must be expressed by a number between 1 and 10, multiplied by a power of 10.

Scientific notation = 8.3 x 10^-2