Question

please give correct an answer according to class 8 . and even give the solution like how did u get answers . please give answer only if u know or don't plese​
I need even explanation how the answer came .​​​

Answer 1

Step-by-step explanation:

Solutions:-

(a)

Given rational numbers are :

2/9, -2/9, 4/-7,5/63

=> 2/9 , -2/9 , -4/7 , 5/63

The denominators = 9,9,7,63

LCM of 9,9,7,63 = 63

2/9 = (2/9)×(7/7) = (2×7)/(9×7) = 14/63

-2/9 = (-2/9)×(7/7) = (-2×7)/(9×7) = -14/63

-4/7 = (-4/7)×(9/9)=(-4×9)/(7×9)=-36/63

So the given numbers are 14/63 , -14/63 , -36/63 ,5/63

Ascending order = -36/63, -14/63 ,14/63 ,5/63

=> -4/7 ,-2/9,2/9,5/63

(b)

Given rational numbers are :

2/-5 , -3/7 ,-1/-9 ,7/-10

=> -2/5 , -3/7 ,1/9, -7/10

The denominators = 5,7,9,10

LCM of 5,7,9,10= 630

-2/5 = (-2/5)×(126/126) = (-2×126)/(5×126) = -254/630

-3/7 = (-3/7)×(90) = (-3×90)/(7×90) = -270/630

1/9= (1/9)×(70/70)=(1×70)/(70×9)= 70/630

-7/10 = (-7/10)×(63/63) = (-7×63)/(10×63)=-441/630

So the given numbers are -254/630, -270/630 , 70/630, -441/630

Ascending order = -441/630 , -270/630, -254/630, 70/730

=> -7/10 , -3/7, -2/5 , 1/9

(c)

Given rational numbers are :

-3/5 ,7/-10, -5/8

=> -3/5 , -7/10 , -5/8

The denominators =5,10,8

LCM of 5,10,8 = 40

-3/5 = (-3/5)×(8/8)=(-3×8)/(5×8)=-24/40

-7/10=(-7/10)×(4/4)=(-7×4)/(10×4)=-28/40

-5/8 = (-5/8)×(5/5)=(-5×5)/(8×5)=-25/40

So the given numbers are -24/40, -28/40, -25/40

Ascending order = -28/40 , -25/40 , -24/40

=> -7/10 , -5/8 , -3/5

Answer:-

Ascending orders:-

a) -4/7 ,-2/9,2/9,5/63

b)-7/10 , -3/7, -2/5 , 1/9

c)-7/10 , -5/8 , -3/5

Used formulae:-

• Writting the given rationals to like fractions by their LCM

• Every negative number is always less than than zero.

• Every Positive number is greater than zero.

• Ascending order of numbers Negative numbers< Zero < Positive numbers