23 per 4 + 1 per 2 dikurang 21 per 8

disamakan penyebut
23/4 × 2 = 46/8
1/2 × 4 = 4/8
46+4-21 / 8 = 29/8

23/4 + 1/2 - 21/8
= (23.2) + (1.4) - (21.1) / 8
= 46 + 4 - 21 / 8
=29 / 8
= 3 5/8 (dibaca tiga , lima per delapan)