Explore and find out if each statement is always true, sometimes true or never true. You can give examples to support your reasoning.

Sum of two even numbers gives a multiple of $4$

Explore and find out if each statement is always true, sometimes true or never true. You can give examples to support your reasoning.

Sum of two odd numbers gives a multiple of $4$

Find the remainders obtained when each of the following numbers are divided by $10$:

$78, 99, 173, 572, 980, 1111, 2345$

Find the remainders obtained when each of the following numbers are divided by $5$:

$78, 99, 173, 572, 980, 1111, 2345$

Find the remainders obtained when each of the following numbers are divided by $2$:

$78, 99, 173, 572, 980, 1111, 2345$

Below are some boxes with four numbers in each box. Within each box try to say how each number is special compared to the rest.