explain 7/18-15/19
Let's calculate: 718 -1519
ⓘTo add fractions, put them over the same denominator, then add the numerators
7×19 -15×1818×19
ⓘMultiplications are done before additions and subtractions:
7×19 = (10 + 9)×7 = 10×7 + 9×7 = 70 + 63 = 133‖-15×18 = 18×(-10 -5) = 18×-10 + 18×-5 = -180 -90 = -270‖18×19 = 19×(10 + 8) = 19×10 + 19×8 = 190 + 152 = 342
133 -270342
ⓘThe numerator and the denominator are computed before the division: 133 -270 = -137
▶Result:   -137342
The approximate value of: -137342 is:
▷ ≈ -0.4006