Add and subtract fractions, including mixed numerals and fractions with unrelated denominators, using written and calculator methods

1. Only a portion: Fraction addition 1/4+7/12=*
2. Pass the pieces, please!: Fraction addition *+1/2=7/12
3. Fraction output: Fraction addition *+2/3=3/4
4. Fractional output: Fraction addition 1/4+1/5=*
5. Fractions mounting: Fractions addition 1/3+1/2=*
6. Fractured addition: Addition of fractions
7. Fractions Divide: 1/2 / 3/4
8. Fractions Add: 3/5+3/4
9. Fractions Add: 1/2+1/8
10. Fractions Add: 1/2+1/5
11. Fractions Add: 1/4+?=9/20