number

To put your own needs before other people's

A clear top item on charts or rankings that is much more popular than others

Make someone face consequences they cannot avoid

To be likely to cause trouble for someone

To become red in the face when you feel embarrassed

The first and most important person or thing in a list

Someone or something that is second in order

A set of numbers people use to call each other

Many people or things counted together

A number the United States gives to people to show who they are, pay taxes, and get government benefits

A set of numbers people use to call someone by phone

Numbers or letters on a car's number plate that identify the vehicle

A phone number you call by mistake

A secret number that lets you access bank or phone accounts

A whole number you can split into two equal parts

A whole number greater than 1 that you can divide only by 1 and itself

A value that can be shown on a straight line, like 3, 1/2, or pi

A phone number to call for help in an emergency, for example the police or an ambulance

A unique number shown on a vehicle's license plate to identify it

A number that shows which page in a book or document

Doing long, complex calculations, often using a computer

A person who works with many numbers and can do difficult calculations using computers

A device or program that produces numbers that do not follow a pattern

A number with no fraction and no decimal, such as 0, 1, or -3

Number of protons in an atom's center that shows its place in the periodic table

A person who has the same job in another company or country

A way to write numbers using digits, like decimal or binary

A number used for counting that starts at one and goes up

A number for a mailbox at a post office where someone receives mail

A number in the form a plus b i, where i is the square root of minus one

A code of letters and numbers on a library book that shows where it is on the shelf

A number with a real part and an imaginary part written as a + bi

A secret number you use to prove who you are and open accounts

A number that cannot be written as a fraction, for example π or √2

A computer that does many math calculations very quickly

A number used to receive mail at a post office box

A number that shows how things like prices change over time or between places

A number that can be written as a fraction like 3/4 or -1/2

A person who studies whole numbers and patterns, like prime numbers

A number that is not a solution of any polynomial equation with rational coefficients

The British Prime Minister, their home at 10 Downing Street, or the main attacking player in football

A count of repeating movements per metre of light or sound

The total number of protons and neutrons in an atom's nucleus

A number in a list where each equals the sum of the two before, starting with 0 and 1

A number that shows position in a list

A number that shows how many things there are, not their order, for example one, two, three

A value that shows how wide a camera lens opens to let light in

A number that shows how many electrons an atom has lost or gained in compounds and ions

The number of atoms or molecules in one mole of a substance, about 6.022 × 10^23

A number that computers store to show very large or very small values approximately

A rare earth metal called erbium that is used in lasers

How fast something moves compared with the speed of sound around it

The number of atoms or molecules in one mole, about 6.022 × 10^23

A number for a box at the post office where you receive mail

A number that shows how wide a camera lens opens to let light in

A number system using digits 0 to 9 that counts in tens

A whole number greater than one that can be divided evenly by a number other than one and itself

A way to write numbers using only 0 and 1

A number that solves a polynomial equation with rational coefficients

A number that shows how well fuel resists knocking in car engines

An amount shown using two or more different units, like one hour and ten minutes

A strong shiny grey metal used in nuclear reactors

A rule that makes verbs and adjectives match a noun's singular or plural

A heavy radioactive metal used as fuel in nuclear reactors and in weapons

How many people someone has had sex with

A code you enter to activate software or an online service

The difference in number between matter particles and antimatter particles that stays the same when particles react

A colorless gas used in bright red signs and lights

A person who is no longer important or fashionable

A number of protons or neutrons that makes a nucleus especially stable

A heavy, rare metal used in strong metal mixtures and often found with platinum

A radioactive metal called polonium that is found with uranium and used in some devices

A very heavy radioactive metal made by scientists and named copernicium

An imaginary being people blame for luck in games and gambling

A light strong metal called titanium used to make medical implants and airplane parts

A code of digits that shows which bank or card company handles a payment

A number showing how hard a metal is by pressing a steel ball into it

A way of writing numbers that uses twelve as its base and digits 0 to 11