Understand the absolute value of a rational number as its distance
from 0 on the number line; interpret absolute value as magnitude
for a positive or negative quantity in a real-world situation. For
example, for an account balance of –30 dollars, write |–30| = 30 to
describe the size of the debt in dollars.
Math.6.NS.7d or 6.NS.C.7.D
Distinguish comparisons of absolute value from statements about
order. For example, recognize that an account balance less than –30
dollars represents a debt greater than 30 dollars.