(a) 6 +(+10)

(b) 5 - -3

(c) -4 × -6

(d) +6 ÷ -2

(a) 6 + (+10) = 6 + 10 ( + + = +)
= 16

(b) 5 - -3 = 5 + 3 ( - - = +)
= 8

(c) -4 × - 6 = + 24 [(-) × (-) = +]
= 24

(d) + 6 ÷ -2 = - 3 [(+) ÷ (-) = - ]

(a) 5 + - 18 - - 9

(b) 23 - (5 - - 7)

(c) 5 × - 4 + - 8

(d) -25 ÷[5 ×-2 -(-3 × 5)]

(a) 5 + - 18 - - 9 = 5 - 18 + 9
(+ - = - , - - = + )
= -13 + 9
= - 4

(b) 23 - (5- -7) = 23 -(5 + 7)
( - - = +)
= 23 -(12)
= 11

(c) 5 × - 4 + -8 = -20 + -8
(අනුක්‍රමය : පළමුව × අනතුරුව +)
= - 20 - 8 (+ - = -)
= -28

(d) -25 ÷ [ 5 × -2 -(-3 ×5) ]
= - 25 ÷ [5 × -2 -( -15)]
( -3 ×5 = -15 )
= - 25 ÷ [ -10 - (-15) ]
(5 × -2 = -10)
= -25 ÷ [-10 + 15] ( - - = + )
= -25 ÷ [5]
= - 5 ( - ÷ + = - )