Patterns with numbers

This task is about number patterns.
 
pattern numbers.png

Continue the patterns by writing in the missing numbers.

Question 1Change answer

a)  Write in the missing numbers.
     6, 7, 8, 9, , , , 

Question 1Change answer

b)  Write in the missing numbers.
     10, 15, , 25, , , .

Question 1Change answer

c)  Write in the missing numbers.
     8, 10, 12, , , 18, 

Question 1Change answer

d)  Write in the missing numbers.
     16, 14, 12, , , 6, 

Question 1Change answer

e)  Write in the missing numbers.
     15, 13, 11, , , , .

Question 1Change answer

f)  Write in the missing numbers.
     6, 9, 12, , , , 24,