The Number Line with Signed Numbers: Complete the missing numbers

What are the missing numbers?

Let's look at the numbers from left to right:

$-6,-4,-2$

We notice that the common operation is:

$+2$

$-6+2=-4$

$-4+2=-2$

Therefore, the next sequence will be:

$-2+2=0$

$0+2=2$

0,2

Fill in the missing numbers

Let's look at the numbers from left to right:

$-3,3,9,15$

We notice that the common operation is:

$+6$

$-3+6=3$

$3+6=9$

$9+6=15$

Therefore, the next sequence will be:

$15+6=21$

$21+6=27$

27, 21

Fill in the missing number

Let's begin by looking at the numbers from left to right:

$0,\frac{1}{2},1,1\frac{1}{2}$

We are able to deduce that the common operation is:

$+\frac{1}{2}$

$0+\frac{1}{2}=\frac{1}{2}$

$\frac{1}{2}+\frac{1}{2}=1$

$1+\frac{1}{2}=1\frac{1}{2}$

Therefore, the next sequence will be:

$1\frac{1}{2}+\frac{1}{2}=2$

$2+\frac{1}{2}=2\frac{1}{2}$

$2\frac{1}{2}+\frac{1}{2}=3$

$2,2\frac{1}{2},3$

Fill in the missing number

Let's look at the numbers from left to right:

$0,2,4,6,8$

We notice that the common operation is +2:

$0+2=2$

$2+2=4$

$4+2=6$

$6+2=8$

$8+2=10$

Therefore, the next sequence will be:

$10+2=12$

$12+2=14$

$14+2=16$

$16+2=18$

18, 16, 14, 12