Question

a200b
(12) 10 - 4 =
(13) 11 - 7 =
(14) 14 - 9 =
(15) 12 - 8 =
(16) 18 - 9 =
(17) 15 - 5 =
(18) 13 - 8 =
(19) 16 - 9 =
(20) 17 - 6 =
(21) 19 - 3 =
(22) 20 - 2 =

Explanation:

(12)

Step1: Subtract 4 from 10

$10 - 4 = 6$

Step1: Subtract 7 from 11

$11 - 7 = 4$

Step1: Subtract 9 from 14

$14 - 9 = 5$

Answer:

6

(13)