Reading and writing numbers to 1000
Read and write numbers to 1000 in numerals, number names, and expanded form
What a learner can do afterwards
- Read a three-digit numeral aloud correctly
- Write a three-digit number in words (e.g. 'three hundred and forty-two')
- Write a number in expanded form (e.g. 600 + 30 + 7)
1 · Read
You already know that a three-digit number has a hundreds digit, a tens digit, and a ones digit. Now you will read numbers like 342 out loud, write them in words, and break them apart into hundreds, tens, and ones.
Look at 508. There are 5 hundreds, 0 tens, and 8 ones. We skip the tens word and say 'five hundred and eight'. In expanded form it is 500 + 0 + 8.
Watch out when the tens digit is 0. Do not turn the ones digit into a 'ty' word. 508 is 'five hundred and eight', not 'five hundred and eighty'.
A numeral, its words, and its expanded form all name the same number in three different ways.
More to read
Intro to place value: FAQ
Reading a three digit number starts at the left. Say the hundreds, then the tens, then the ones. The number 452 reads as four hundred and fifty-two.
When a place holds zero, skip it in words but keep it in numerals. The number 608 reads as six hundred and eight.
Whole numbers in expanded form review
Expanded form turns a numeral into a sum. The number 637 is 600 + 30 + 7. Each part matches one spoken word group.
Going the other way, add the parts back into one numeral. 500 + 60 + 9 packs back into 569.
Whole number place value review
Place value links how a number looks, sounds and splits. The digits 637 mean 6 hundreds, 3 tens and 7 ones all at once.
Say it, write it in words and expand it: six hundred and thirty-seven is 600 + 30 + 7. All three forms name the same number.
3 Ways to Decompose Numbers
Breaking numbers apart makes them easy to read and write. Split 342 into 300 + 40 + 2 and each chunk is simple to say.
Build numbers the same way. Hundreds first, then tens, then ones, and the full number appears.
Explore more
2 · Watch
به انگلیسیTake it off screen
Where it sits
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
18 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.