Question

a188b
(12) 15 - 4 =
(13) 15 - 6 =
(14) 15 - 5 =
(15) 15 - 9 =
(16) 15 - 7 =
(17) 16 - 3 =
(18) 16 - 2 =
(19) 16 - 5 =
(20) 16 - 8 =
(21) 16 - 6 =
(22) 16 - 9 =

Explanation:

(12)

Step1: Subtract 4 from 15

$15 - 4 = 11$

Step1: Subtract 6 from 15

$15 - 6 = 9$

Step1: Subtract 5 from 15

$15 - 5 = 10$

Answer:

11

(13)