Lesson: adding and subtracting like fractions:
solve
1/9 + (-5/9)=?
3/8 + (-7/8)=?
-3/4 + (-3/4)=?
lesson: adding and subtracting unlike fractions:
solve
(-7/10) - (2/5)=?
(-4/9) - (2/15)=?
p. s: the parentheses are just so the negative and positive (+) numbers and signs don't get mixed up! you for your !

When adding/subtracting like fraction, simply keep the denominators the same, and add/subtract the numerators

1/9+(-5/9)= -4/9

3/8+(-7/8)= -4/8

-3/4+(-3/4)=-6/4

When adding/subtracting unlike fractions, We have to find the LCM of the denominators, and then find the fractions equivalent with that denominator. Then add/subtract the numerators.

-7/10 - 2/5= -7/10 - 4/10= -11/10

-4/9 - 2/15= -20/45 - 6/45= -26/45

1) 
Steps: Simplify brackets, subtract numerators.

2)  
Steps: Simplify brackets, subtract numerators, simplify into simplest form.

3) 
Steps: Simplify brackets, add numerators, change into simplest form.

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1) 
Steps: Simplify brackets, simplify.

2) 
Steps: Simplify brackets, simplify.

31 is prime. and it’s prime factorization is just 31.