1.   Find the missing number:

5 + ∅ = 7
    A. 35 B. 57
    C. 12 D. 2
    Hint
  2.   Find the missing number:

3 × ∅ = 24
    A. 8 B. 21
    C. 27 D. 72
    Hint
  3.   Write an expression for the product of 3 and n.
    A. n − 3 B. n ÷ 3
    C. 3 + n D. 3n
    Hint
  4.   Write an expression for 12 plus q.
    A. 12 ÷ q B. q − 12
    C. 12 + q D. 12q
    Hint
  5.   Write an expression for r divided by 8.
    A. 8r B. r + 8
    C. r − 8 D. r ÷ 8
    Hint