1.   Solve 9 + __ = 13.
A. 5 B. 6
C. 4 D. 22
Hint

2.   Find 9 + 2 + 1.
A. 10 B. 13
C. 18 D. 12
Hint

3.   Write an expression for the situation.

three more than y

A. y + y + y B. y + 3
C. 3 − y D. y − 3
Hint

4.   The length of a bottle-nose dolphin is 48 inches more than the length of a buffeo dolphin. Let l = the length of a buffeo dolphin.Write an expression for the length of a bottle-nose dolphin.
A. l + l + 48 B. l + 48
C. 48 - l D. l − 48
Hint

5.   Solve n − 12 = 12 mentally.
A. n = 18 B. n = 0
C. n = 12 D. n = 24
Hint

6.   Solve 15 − v = 7 mentally.
A. v = 6 B. v = 7
C. v = 8 D. v = 22
Hint

7.   Write an equation that describes the pattern.

 Input (a) 8 12 16 20 24 28 Output (b) 11 15 19   

A. a + b = 3 B. a + 3 = b
C. a + 4 = b D. a 3 = b
Hint

8.   The amounts the cafeteria collects serving lunch are shown. How much would the cafeteria collect for serving 30, 40, and 50 students lunch?

 Students Amount 10 \$30 20 \$60 30  40  50 

A. \$70, \$80, \$90 B. \$90, \$130, \$160
C. \$90, \$120, \$150 D. \$70, \$90, \$110
Hint

9.   Find the missing number in the equation.

15 + 2 = 7 + 8 + __

A. 7 B. 2
C. 8 D. 6
Hint

10.   Find the missing number in the equation.

8 + 5 + 7 = 8 + 7 + __

A. 5 B. 6
C. 7 D. 15
Hint