| 19. |
a.
Choose two even numbers under 100 and add them. Is the
result even or odd? |
|
b.
Do the same thing for two odd numbers. |
|
c.
If the sum of two numbers is odd, what can you
say about the two numbers?
|
| 20. |
a. How can you explain that the sum of an even number
and an odd number is always odd? Use dot patterns to
show your reasoning. |
|
b.
Show with dot patterns that the sum of two odd numbers
is even. |
| 21. |
Two
V-patterns of wild geese come together and form one
group. Can the new group form a perfect V-pattern? |
