Correction :

4 × 9 = 36	19 - 18 = 1
14 - 4 = 10	27 : 3 = 9
5 - 0 = 5	2 + 23 = 25
9 + 1 = 10	40 - 19 = 21
41 - 22 = 19	15 + 23 = 38
20 - 20 = 0	24 + 0 = 24
1 × 10 = 10	10 × 11 = 110
4 × 10 = 40	39 - 18 = 21
3 + 23 = 26	27 - 11 = 16
3 + 10 = 13	11 + 0 = 11