## Ans 1: (Master Answer)

The correct answer is A.

Count the number of total balls = 21

Count the number of crossed balls = 6

So, the subtraction sentence will be **21 - 6.**

Now make the subtraction sentences for all options:

(A) 2 tens 1 one - 6 ones = 21 - 6

(B) 2 tens 2 ones - 6 ones = 22 - 6

(C) 2 tens - 6 ones = 20 - 6

(D) 2 tens 3 tens - 6 ones = 23 - 6