7
5
10
-2
It is: (5+2)*10 = 70
-5 + 3 = -2
2+2+2+10+5+5+5+20+20+20+20+20+20=151
Just realize that multiplication is repeated addition. So you have 6 twos and 5 fives. that is 12+25 and now add 55 The total is 92
2 + 5 + (3 x 2) + 4 +2 + 17 + (2 - 13) + 5 = 30
50616
5 + 2 = 7
5
5 + 5 + 4 + 4 + 2 = 22