1.   Find the missing number:

∅ + 9 = 17
    A. 26 B. 8
    C. 153 D. 917
    Hint
  2.   Find the missing number:

∅ + 7 = 14
    A. 21 B. 7
    C. 98 D. 714
    Hint
  3.   Find the missing number:

3 × ∅ = 24
    A. 21 B. 27
    C. 72 D. 8
    Hint
  4.   Find the missing number:

∅ × 6 = 30
    A. 36 B. 24
    C. 5 D. 180
    Hint
  5.   Find the missing number:

∅ × 5 = 45
    A. 50 B. 40
    C. 9 D. 225
    Hint
  6.   Jean-Robert added 8 telephone numbers to his cell phone. Now he has 19 numbers on his phone. How many did he have at first?
    A. 819 B. 157
    C. 11 D. 27
    Hint
  7.   Write an expression for 5 less than y.
    A. 5 + y B. 5y
    C. y − 5 D. y ÷ 5
    Hint
  8.   Write an expression for the sum of p and 17.
    A. p − 17 B. p ÷ 17
    C. 17p D. p + 17
    Hint
  9.   Write an expression for 12 plus q.
    A. 12 + q B. 12 ÷ q
    C. 12q D. q − 12
    Hint
  10.   Write an expression for r divided by 8.
    A. r + 8 B. 8r
    C. r ÷ 8 D. r − 8
    Hint