A little understanding. A world of big numbers.
Learn to read, name and make sense of large numbers, one group at a time.
Where should I start?
If a long number feels confusing, begin with reading groups of three. If you can read it but want to know what each digit means, use the place-value chart. Then compare the size of a million, a billion and a trillion.
Read and write numbers
Start with groups of three, then connect digits, number words and place value.
Understand number names and zeros
Follow the short-scale sequence and see exactly how each named number is written.
Compare the size of big numbers
Use ratios and worked examples to understand the jump from millions to billions and trillions.
Practise and teach
Choose a number range, read examples aloud and make printable practice with matching answers.
Learn with your own number
The Big Number Explorer shows number words, scientific notation and the value of every digit. It uses English short-scale names: a billion is 1,000 million. Try a number, then return to a guide whenever you want an explanation.
Open Big Number Explorer