Numbers are everywhere in daily life. You use them to tell the time, pay for coffee, share your phone number, book a flight and celebrate a birthday. Yet many English learners feel unsure the moment a number grows longer than ten. The good news is that English numbers follow clear, repeating patterns. Once you understand the building blocks, you can say almost any number with confidence.
This guide walks you through cardinal and ordinal numbers, the tricky teens, large numbers, decimals, fractions, and the way native speakers actually say numbers for money, dates and phone numbers.
Cardinal Numbers: Counting from Zero
Cardinal numbers answer the question “how many?” They are the numbers you use to count objects: one apple, three friends, twenty students. Learning them in small groups makes memorisation much easier.
| Number | Word | Number | Word |
|---|---|---|---|
| 0 | zero | 11 | eleven |
| 1 | one | 12 | twelve |
| 2 | two | 13 | thirteen |
| 3 | three | 14 | fourteen |
| 4 | four | 15 | fifteen |
| 5 | five | 16 | sixteen |
| 6 | six | 17 | seventeen |
| 7 | seven | 18 | eighteen |
| 8 | eight | 19 | nineteen |
| 9 | nine | 20 | twenty |
| 10 | ten | 100 | one hundred |
The Tens and Everything in Between
The multiples of ten (twenty, thirty, forty, and so on) are your anchors. To build any two-digit number, join the ten and the unit with a hyphen: twenty-one, thirty-four, fifty-six, ninety-nine. Notice the spelling changes you must remember:
- Four keeps its “u,” but forty drops it (not “fourty”).
- Five becomes fifty, and eight becomes eighty (only one “t”).
- Nine becomes ninety (no “e” after “nin”).
Teens vs. Tens: The Classic Trap
Learners often confuse thirteen (13) with thirty (30), or fifteen (15) with fifty (50). The difference is in the stress. In the teens, the second syllable is stressed: thir-TEEN. In the tens, the first syllable is stressed: THIR-ty. Practising this out loud will save you from countless misunderstandings, especially with prices and ages.
Ordinal Numbers: Putting Things in Order
Ordinal numbers describe position or sequence: first, second, third, fourth. You need them for dates, floors of a building, rankings and instructions. Most ordinals are formed by adding -th to the cardinal number, but the first three are irregular, and a few others change their spelling.
| Cardinal | Ordinal | Written Form |
|---|---|---|
| one | first | 1st |
| two | second | 2nd |
| three | third | 3rd |
| four | fourth | 4th |
| five | fifth | 5th |
| eight | eighth | 8th |
| nine | ninth | 9th |
| twelve | twelfth | 12th |
| twenty | twentieth | 20th |
For compound numbers, only the final word becomes ordinal: twenty-first (21st), thirty-second (32nd), one hundred and fifth (105th). Notice how “five” changes to “fifth,” “eight” gains only a “th” (eighth), and “nine” drops its “e” to become “ninth.”
Big Numbers: Hundreds, Thousands and Millions
Large numbers look intimidating, but English groups digits in threes, and each group has a name. Read the number in chunks from left to right.
- 100 – one hundred
- 1,000 – one thousand
- 1,000,000 – one million
- 1,000,000,000 – one billion
A few rules keep big numbers correct in British and general English:
- Use “and” before the final part in British English: 365 = three hundred and sixty-five. American English often drops the “and.”
- Keep “hundred,” “thousand” and “million” singular after a number: say two hundred, never “two hundreds.” Add an “s” only when speaking generally: hundreds of people.
- Read year-style numbers in pairs where natural: 1985 = nineteen eighty-five.
For example, 2,548,019 is “two million, five hundred and forty-eight thousand, and nineteen.”
Decimals, Fractions and Percentages
Once you leave whole numbers, English uses a few special conventions.
| Type | Written | Spoken |
|---|---|---|
| Decimal | 3.14 | three point one four |
| Fraction | 1/2 | one half |
| Fraction | 3/4 | three quarters |
| Fraction | 2/3 | two thirds |
| Percentage | 50% | fifty percent |
With decimals, read each digit after the point separately: 0.75 is “zero point seven five,” not “point seventy-five.” For fractions, the top number is a cardinal and the bottom number is an ordinal (three-quarters, two-thirds). When the top number is more than one, the ordinal becomes plural.
Numbers in Real Life
Talking About Money
Prices are usually said with the currency between the parts. For example, £12.50 is “twelve pounds fifty,” and $9.99 is “nine ninety-nine” or “nine dollars ninety-nine.” In casual speech, native speakers often drop the word “cents” or “pence” entirely.
Saying Dates
In British English, dates are read with ordinals: the 3rd of May or May the 3rd. Americans usually say May third. Years are typically read in pairs: 2026 = twenty twenty-six.
Phone Numbers
Phone numbers are read digit by digit: 020 7946 0018 becomes “oh two oh, seven nine four six, oh oh one eight.” Note that the letter-sounding “oh” commonly replaces “zero” in casual speech, and a doubled digit is often said as “double,” for example “double oh.”
Tips to Remember English Numbers
- Practise numbers out loud during everyday tasks: read prices, count steps, or say the time.
- Focus on the teens-vs-tens stress difference until it feels automatic.
- Learn ordinals through dates, since you use them almost every day.
- Break long numbers into groups of three before you speak.
- Listen to native audio and shadow the rhythm, not just the words.
Frequently Asked Questions
Do I need to use “and” in large numbers?
In British English, “and” is standard before the last part of a number, as in “one hundred and twenty.” American English usually omits it, saying “one hundred twenty.” Both are understood internationally, so choose the style that matches the English you are learning.
When do numbers take a hyphen?
Use a hyphen for compound numbers between twenty-one and ninety-nine, such as “forty-seven” or “eighty-three.” Larger words like “hundred,” “thousand” and “million” are written separately from the rest of the number.
Why is 40 spelled “forty” and not “fourty”?
It is simply an irregular spelling that developed over time. The number four keeps its “u,” but forty loses it. Fifty, eighty and ninety also change form, so it is best to memorise these four exceptions early.
How do I say a year like 2005?
Years with a zero in the middle are read as “two thousand and five” or “twenty oh five.” From 2010 onward, speakers usually return to pairs, such as “twenty twenty-six” for 2026.
Numbers become second nature with regular, guided practice. If you want personalised feedback on your pronunciation and real conversation practice, book a tutor with The Cognitio and start speaking English numbers with confidence today.