65+2=67
65
+2
------
67
It is: 37+(-2)+(-65)+(-8) = -38
65 + 65 + 65 + 65 + 65 + 65 + 65 + 65 + 65 + 65 + 65 + 65 = 65 x 12 = 780
1+2+3+... +65 = 65*66/2 = 65*33 = 2145 For the required sum, each term is simply double the corresponding term above, so 2+4+6+... + 130 = 2*2145 = 4290
45x2+35x3+65+27+40 Use P.E.M.D.A.S. 90+105+65+27+40 327 So 327 is your answer
65+65=130
245
1, 5, 13 and 65
98 plus 65 equals 163.
65 + 65 + 65 + 90 + 90 + 90 + 90 + 50 + 50 + 50 + 50 + 50 + 50 + 20 + 20 + 20 + 20 + 20 + 20 + 20 = 995
65
65/65=1+65=66
1 + 65 + 56 = 122