Mental Math

105 + 5 =

What is the sum of 17, 10 and 8?

What is the next number?

3, 6, 9, 12, ______

How many  $\frac{1}{4}$  hours make  $\frac{3}{4}$  of an hour?

How many rectangles can you count?

Which one is the odd one out: midday, midnight or noon?

How many corners has a cube?

• 6

• 8

• 12

How many  $\frac{1}{2}$  oranges are there in  $3\ \frac{1}{2}$  oranges?

Increase ten thousand by 800. (Write answer in figures)

 $5^{2\ \ }=\ 25$  

 $7^{2\ }=$  ?