πρόσθεση ρητών αριθμών

Edit Answers
123456
Across
  1. 1. (-18)+(+16)=
  2. 2. (+20)+(+12)=
  3. 3. (+17)+(-20)=
  4. 4. (+20)+(-12)=
  5. 5. (-25)+(+20)=
  6. 6. (-3)+(+4)=
Down
  1. 1. (-20)+(-12)=
  2. 2. (-17)+(+20)
  3. 3. (-20)+(+12)=
  4. 4. (-20)+(+25)=
  5. 5. (+3)+(-4)=
  6. 6. (-16)+(+18)=