Question

5.) 25×34-25×33=....
6.) 12+22+32+42=.....

Answer 1

15*34-25*33=850-825=25
12+22+32+42=108

Answer 2

5) 25*34-25*33=
  25*(34-33)=
  25*1=
  25

6)12+22+32+42=
  34+32+42=
  66+42=
  108