Imperial Units - Length

Four

In English, number 4 (four) is the only number containing the same number of letters as itself when spelt.

Ones and Only Ones

If you multiply numbers containing only 1s, you always get answers that are palindromic numbers (numbers that read the same in both directions).

1​1 × 11 = 121

1​11 × 111 = 12321

1​111 × 1111 = 1234321

Piece of Cake

It is actually possible to divide a cake into 8 equal pieces with only 3 cuts.

C​an you figure out how?

Time

Day: 24 hours

H​our: 60 minutes

M​inute: 60 seconds

Second: 1000 milliseconds

French people love cheese so much that pie charts are often referred to as 'camembert'.

Integer

T​he word integer is another way of saying whole numbers.

1​, 254, -7 are examples of integers.

18

Number 18 is the only two-digit number that is twice the sum of its digits.

PAYE Scheme

PAYE (pay as you earn) schemes are used in many countries to deduct employees' tax contribution (and other governmental taxes like medical cover etc...) directly from their salary.

C​ountries not using such schemes require people to retain parts of their salary themselves so they can later pay their income taxes (or else) when requested.