use only 10s to make the number 40 in two parts (5 ways)

1+3
2+2
3+1
what are the other two?

To find the remaining two ways to make the number 40 using only 10s in two parts, we can start by understanding the pattern of the previous three ways:

1. 1 + 3 = 4
2. 2 + 2 = 4
3. 3 + 1 = 4

From these examples, we can observe that the sum of the two parts is always 4. Now, let's apply this pattern to find the remaining two ways:

4. 0 + 4 = 4
We can have one part equal to 0 and the other part equal to 4. Adding these two parts together gives us the number 4.

5. 4 + 0 = 4
Alternatively, we can have one part equal to 4 and the other part equal to 0. Again, combining these two parts gives us the number 4.

So, the remaining two ways to make the number 40 using only 10s in two parts are:

4. 0 + 4
5. 4 + 0