3 1/2 + 3 5/8 - 3/5=

3 1/2 = 3 20/40
3 5/8 = 3 25/40
3/5 = 24/40
= 3 20/40 + 3 25/40 - 24/40
= 6 45/40 - 24/40
= 6 21/40

penjumlahan dan pengurangan pecahan

3 1/2 + 3 5/8 - 3/5
= 7/2 + 29/8 - 3/5
= 140/40 + 145/40 - 24/40
= 285/40 - 24/40
= 261/40
= 6 21/40