7.69x101
=7.69x(100+1)
=7.69x100+7.69x1
=769+7.69
=776.69
8.36-2.48-3.52
=8.36-(2.48+3.52)
=8.36-6
=2.36
0.25x39+0.25
=0.25x(39+1)
=0.25x40
=10