10 or 100 More and Less

Count by 10's.  What number comes next?
61, 71, 81, 91, ____?

• 92
• 110
• 101
• 100

Count by 10's.  What numbers are missing?
27, ____, ____, 57, 67

• 30, 35
• 37, 77
• 37, 47
• 40, 45

Count by 10's.  What pattern is right?

• 10, 20, 25, 50
• 7, 17, 27, 37
• 90, 91, 92, 93
• 50, 55, 60, 65

Count back by 10s to finish the pattern. 
100, ____, 80, 70, 60, ____

• 90, 50 
• 100, 80 
• 70, 50 
• 110, 120