Pls explain how to solve these fractions

-1/6

Step-by-step explanation:

find a common denominator. the easiest way to do that is multiply them together. 3x2 is 6

so what do you multiply 2 by to get to 6? 3.

so you multiply 1/2 by 3/3 (which is a fancy 1) to get 3/6

same for the other side multiply by 2/2 to get 4/6

3/6- 4/6 = -1/6

the 8 in 8,420 is in the thousands place so it's value is 8 thousand.

the 8 in 6,870 is in the hundreds place so it's value is 8 hundred.

divide 8000 by 800 to find the answer:

8000 / 800 = 10

the 8 in 8,420 is 10 times greater than the 8 in 6,870