Addition

123456
Across
  1. 1. 2+2=
  2. 3. 3+3=
  3. 4. 5+7=
  4. 5. 10+10=
Down
  1. 1. 4+1=
  2. 2. 1+7=
  3. 4. 2+8=
  4. 6. 1+1=