Reading and writing numbers to 1000
Read and write numbers to 1000 in numerals, number names, and expanded form
Ce que l'enfant saura faire ensuite
- 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 · Lis
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.
À lire aussi
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.
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2 · Regarde
En anglaisSans écran
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