10 9/10 + 5 1/10
⚠ 10 9/10 is read as the mixed number 10 + 9/10
⚠ 5 1/10 is read as the mixed number 5 + 1/10
Let's evaluate: 10 + 910 + 5 + 110
ℹ10 + 5 = 15‖910 + 110 = 9 + 110
15 + 9 + 110
ℹ9 + 1 = 10
15 + 1010
ℹ1010 = 1
15 + 1
▶Result:   16