1.   Find the missing number:

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

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

∅ × 6 = 30
    A. 180 B. 24
    C. 5 D. 36
    Hint
  4.   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. 27 B. 157
    C. 819 D. 11
    Hint
  5.   Write an expression for the sum of p and 17.
    A. p ÷ 17 B. 17p
    C. p + 17 D. p − 17
    Hint