Chocolate milk homework

This task is about what happens when you add 1 or multiply by zero.
James spilt chocolate milk over his maths homework sheet.
 
a) Write the missing number on each milk spot to finish each equation.
  i)
4 + = 4
ii) + 9 = 9
         
  iii) 17 × = 17 iv) × 7 = 7
         
         
b)
Write the missing sign (+ or × ) on each milk spot to finish each equation.
  i) 8 0 = 8 ii) 4 1 = 4
         
  iii) 1 10 = 10 iv) 0 6 = 6