Skip Counting by 5's

Question or Hint Answer or Word

I am skip counting by 5's, fill in the missing numbers 5,10,____,____,25 15,20 (wrong answers: 10,15, 10,20, 12,14, 5,6)
I am skip counting by 5's, fill in the missing number 5,____,15,20 10 (wrong answers: 6, 8, 3, 11)
I am skip counting by 5's, fill in the missing numbers 5,10,15,____,25,____,35 20,30 (wrong answers: 16,26, 24,29, 7,11, 9,13)
What number comes after 45 when skip counting by 5's? 50 (wrong answers: 40, 46, 18, 15)
What number comes after 50 when skip counting by 5's? 55 (wrong answers: 60, 51, 4, 6)
What number comes after 75 when skip counting by 5's? 80 (wrong answers: 74, 76, 8, 14)