Complete the following: a) 4 − 4 = 0 b) 20 − 15 = 5 c) 100000 − 50000 = 50000 d) 299999 − 299999 = 0 e) 100 − 50 = 50 2. Replace: The values for the shapes are: • Red square = 5 • Green rectangle = 25

$$4 - 4 = 0$$

The completed value is $\boxed{4}$.

b) $\boxed{20} - 15 = \boxed{5}$

$$20 - 15 = 5$$

The completed values are $\boxed{20}$ and $\boxed{5}$. (Other valid pairs are possible, e.g., 15 and 0, or 30 and 15).

c) $100000 - \boxed{50000} = \boxed{50000}$

$$100000 - 50000 = 50000$$

The completed values are $\boxed{50000}$ and $\boxed{50000}$. (Other valid pairs are possible).

d) $\boxed{299999} - 299999 = 0$

$$299999 - 299999 = 0$$

The completed value is $\boxed{299999}$.

e) $\boxed{100} - \boxed{50} = \boxed{50}$

$$100 - 50 = 50$$

The completed values are $\boxed{100}$, $\boxed{50}$, and $\boxed{50}$. (Other valid triplets are possible).

2. Replace:

The values for the shapes are:

• Red square = 5
• Green rectangle = 25
• Red hexagon = 0.5
• Yellow circle = 500
• Blue pentagon = 0 (based on the blurry image and context)

a) Yellow circle - Yellow circle = 0

$$500 - 500 = 0$$

The calculation is $\boxed{500 - 500 = 0}$.

b) Red square - Red square = 0

$$5 - 5 = 0$$

The calculation is $\boxed{5 - 5 = 0}$.

c) Red hexagon - Red hexagon = 0

$$0.5 - 0.5 = 0$$

The calculation is $\boxed{0.5 - 0.5 = 0}$.

d) Blue pentagon - Blue pentagon = 0

$$0 - 0 = 0$$

The calculation is $\boxed{0 - 0 = 0}$.

e) Green rectangle - Green rectangle = 0

$$25 - 25 = 0$$

The calculation is $\boxed{25 - 25 = 0}$.