Question

120 + 130 + 140 + 150 + 160 + 170 + 180 + 190 

Answer 1

120+130+140+150+160+170+180+190

=(120+190)+(130+180)+(140+170)+(150+160)

=310+310+310+310

=1240

Answer 2

\(120+130+140+150+160+170+180+190\)
\(=\left(120+180\right)+\left(130+170\right)+\left(140+160\right)+\left(150+190\right)\)
\(=300+300+300+340\)
\(=1240\)
#gboy2mai

Answer 3

\(120+130+140+150+160+170+180+190\)

\(=\left(120+180\right)+\left(130+170\right)+\left(140+160\right)+\left(150+190\right)\)

\(=300+300+300+340\)

\(=1240\)