1. EASY

\(1-1=\)

 
2. MEDIUM

\(5-2=\)

 
3. MEDIUM

\(5-1=\)

 
4. MEDIUM

\(8-7=\)

 
5. MEDIUM

\(4 - 2 = \)

 
6. MEDIUM

\(9-5=\)

 
7. MEDIUM

\(7-5=\)

 
8. HARD

\(8-3=\)

 
9. HARD

\(10-7=\)

 
10. HARD

\(10-3=\)