A bag contains 4 red marbles, 3 blue marbles, and 5 green marbles.

If one marble is picked at random, what is the probability that it is NOT green?

In a class of 24 students, exactly half like maths.

Of those who like maths, one third also play chess.

How many students like maths and play chess?

A rectangle has a perimeter of 30 cm.

Its length is 9 cm.

What is the area of the rectangle?

Tom is 3 times as old as his sister Lily.

In 6 years, Tom will be twice as old as Lily.

How old is Lily now?

What is 248 + 176?

A pack of stickers costs $3. Mia buys 4 packs and pays with a $20 note.

How much change should she receive?

A square has a perimeter of 28 cm.

What is the length of one side?

The table shows how many books four children read this month.

How many more books did Cara read than Ben?

Look at the pattern:

5, 11, 17, 23, ___

What is the next number?