Question

Write an number sentence to add 6 ones to 21.Write a number sentence to add 6 tens to 21

Answer 1

I do suppose that you refer to adding these quantities:
6/1 + 21 = 6 + 21 = 27
and
6/10 + 21
= 3/5 + 21
= 3/5 + 105/5
= 108/5