Correction :

21 + 24 = 45	2 + 22 = 24
2 × 11 = 22	15 + 12 = 27
10 - 10 = 0	46 - 24 = 22
22 + 23 = 45	31 - 14 = 17
11 × 10 = 110	20 - 13 = 7
19 - 3 = 16	72 : 9 = 8
10 - 3 = 7	14 + 10 = 24
10 - 5 = 5	16 + 14 = 30
33 - 16 = 17	21 - 12 = 9
10 × 8 = 80	0 + 23 = 23