If you add up the digits of any number in the 9 times table, you’ll always get 9.
e.g. 243 is in the 9 times table (it’s 27 × 9)
2 + 4 + 3 = 9
99 is in the 9 times table (it's 11 × 9)
9 + 9 = 18
Oh no! That's not 9...add up again
1 + 8 = 9
The symbol for infinity is ∞
Where do mathematicians go to in New York?
Times Square
The positive numbers that we count with (1, 2, 3, 4, ...) have a special name.
They are called Natural numbers.
The mean is a type of average.
To calculate it, add all the numbers together and divide by how many there are.
The median is a type of average.
To find it, put the numbers in order and find the middle.
The mode is a type of average.
It is the most common value, and is the only type of average that can be used with non-numerical data.
How do you count cattle?
With a cow-culator.
You may have heard pirates in films say 'pieces of eight', but where does this come from?
The Spanish silver dollar at the time was worth 8 Reales (a unit of currency in Spain before 1868), and because, unlike today, cutting up or defacing money wasn't illegal, people would cut the dollar coin into 8 pieces to be used as change when trading!
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