Reading and writing numbers to 1,000
In 2nd grade, children learn to read and write numbers up to 1,000 as numerals, in words, and in expanded form, like 400 + 30 + 6.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
Try these with your child
These are real questions from our 2nd grade practice. Tap the speaker to hear one read aloud, or the light bulb for a hint, and talk about the answer together.
Question 1 of 3
How is 700 + 40 + 3 written in standard form?
- 743
- 734
- 473
Why this matters
Writing a number in different ways helps your child see exactly what each digit is worth. Writing 527 as 500 + 20 + 7 is what lets them add and subtract larger numbers by working with hundreds, tens, and ones separately. Matching spoken number names to digits matters in daily life too, like writing down a price or house number someone says aloud. In 4th grade, the same forms stretch to numbers in the thousands and beyond.
Where kids can get stuck
- Writing numbers exactly as they sound, such as 40036 or 400306 for four hundred thirty-six, instead of 436.
- Writing expanded form with digits instead of values, such as 4 + 3 + 6 for 436.
- Leaving out a part when a zero is involved, writing 500 + 6 for 560, or 56 for five hundred six.
How you can help
- Read prices, addresses, or page numbers aloud together, then ask your child to write one down in words, such as four hundred twelve for page 412.
- Make a number with play money or coins and ask your child to say it and write it as an addition, such as 300 + 40 + 2 for three one-dollar bills, four dimes, and two pennies.
- Say a number out loud, like six hundred five, and have your child write it as a numeral on a sticky note or in the steam on a bathroom mirror.
If it’s helpful, you can watch the kid-friendly video below, or sign up for free, adaptive practice in Bobby's Math Club.
Kid-friendly explanation
Questions parents ask
Why is my child learning expanded form?
Expanded form shows the value of each digit, making place value easy to see. Writing 527 as 500 + 20 + 7 helps your child understand why 527 is greater than 499 and how to add or subtract larger numbers by place. It is a tool for understanding rather than an end in itself.
Why does my child write two hundred six as 2006?
Your child is writing each part as they hear it: two hundred, then six. They have not yet realized that the 6 fits inside the 200 and that a zero holds the empty tens place. Writing the number in expanded form, 200 + 6, then showing how the digits stack together into 206, helps.
Does my child need to spell number words correctly?
The main goal is understanding that the words and the digits describe the same amount. Spelling words like forty or ninety correctly is helpful, and many classrooms practice it, but a child who writes "fourty" while understanding the number has the important part. Spelling usually improves with reading practice.
Make learning math fun
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Written by Robert “Bobby” Barnett
Bobby is an award-winning math teacher, the author of Meet Every Learner’s Needs, and the father of two elementary-school math learners. He uses Bobby’s Math Club with his own kids a few times every week. Learn more or contact Bobby.
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Join the clubNote for teachers: This skill is covered by Common Core math standard 2.NBT.A.3: “Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.” Learn how Bobby's Math Club can help your students grow. (Common Core 2.NBT.3)