Question

a181b
(12) 12 - 2 =
(13) 12 - 5 =
(14) 12 - 4 =
(15) 12 - 7 =
(16) 12 - 9 =
(17) 13 - 1 =
(18) 13 - 2 =
(19) 13 - 5 =
(20) 13 - 4 =
(21) 13 - 7 =
(22) 13 - 8 =

Explanation:

(12)

Step1: Subtract 2 from 12

$12 - 2 = 10$

Step1: Subtract 5 from 12

$12 - 5 = 7$

Step1: Subtract 4 from 12

$12 - 4 = 8$

Answer:

10

(13)