

1. 
Solve n − 12 = 12 mentally. 


A. 
n = 24 
B. 
n = 0 


C. 
n = 18 
D. 
n = 12 


Hint 


2. 
Solve 10 + r = 23 mentally. 


A. 
r = 33 
B. 
r = 13 


C. 
r = 7 
D. 
r = 3 


Hint 


3. 
Solve p + 8 = 19 mentally. 


A. 
p = 7 
B. 
p = 9 


C. 
p = 11 
D. 
p = 27 


Hint 


4. 
Solve n  15 = 15 mentally. 


A. 
n = 0 
B. 
n = 30 


C. 
n = 45 
D. 
n = 15 


Hint 


5. 
Choose the equation and solution that represents the sentence. A total of 21 points when 7 points are scored in the first half and n points are scored in the second half of a game. 


A. 
7 − n = 21; 14 
B. 
n − 21 = 7; 28 


C. 
n = 21 + 7; 28 
D. 
7 + n = 21; 14 


Hint 

