Mental Math

20 + 0.6 + 0.02

• 20.62

• 200602

• 262.00

I have a litre bottle of coke. I drink 650ml. How much is left?

• 0.1ml

• 200ml

• 350ml

Which two numbers have a sum of 15 and a product of 36?

A kid's skipping rope is 210cm long. How many rope could I cut from a 10-metres long piece of rope?

• 5

• 4

• 6

How many thirds make 5?

• 5

• 15

• 25

Find the value of (x - 6)/3, if x = 21.

• 15

• 5

• 45

In a group of children, 3/5 like to play tennis. If there are 25 children, how many do not like to play tennis?

• 25

• 18

• 10

Which is the smallest?

0.37, 0.194, 0.6, 0.473, 0.29

A rectangular swimming pool measures  $5\frac{1}{2}$  metres by  $3\frac{1}{2}$  metres. What is the perimeter?

• 18 m

• 34 m

• 314 m

The ratio of lions to tigers in a zoo is 1:3. If there are 12 lions in the zoo, how many tigers do we have?

• 48

• 3

• 36