i-Ready Classroom Mathematics Grade 2, Unit 3: Numbers Within 1000
In this unit, your child explores numbers to 1,000. They see that hundreds, tens, and ones each have their own place, count and skip-count by 5s, 10s, and 100s, read and write numbers in words and in expanded form, and compare numbers with >, =, and <. Next, these place value ideas power adding and subtracting within 1,000.
By Robert “Bobby” BarnettMath teacher, parent, and founder of Bobby’s Math Club
What is my child learning in Unit 3?
- Understanding that 100 is 10 tens and that each digit in a number like 358 shows hundreds, tens, or ones. Learn more: Hundreds, tens, and ones in numbers like 706
- Counting forward and back by 5s, 10s, and 100s within 1,000 and finding the pattern in each count. Learn more about counting within 1,000: Counting within 1,000 · Learn more about skip-counting by 5s, 10s, and 100s
- Writing numbers like 358 as numerals, as number names, and as 300 + 50 + 8. Learn more: Reading and writing numbers to 1,000
- Comparing three-digit numbers by looking at hundreds, then tens, then ones, and using >, =, or <. Learn more: Comparing three-digit numbers with >, =, and <
Sample questions to try together
These are real questions from our 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 many hundreds are in 300?
- 3
- 30
- 300
How you can help
- Read the numbers on a receipt, a mailbox, or a book page and ask your child how many hundreds, tens, and ones each has.
- Count by 10s and 100s together while walking, then count backward from 1,000 by 100s and try going backward by 10s from 340.
- Play a guessing game: "My number has 3 hundreds, 0 tens, and 8 ones." Your child writes 308, then makes one up for you.
Where kids can get stuck
- Leaving out a zero, writing 56 for five hundred six.
- Comparing digits from the right, so 417 seems bigger than 471.
- Losing the count across a hundred going backward, saying 401, 400, 300 instead of 399.
Practice makes perfect
Bobby's Math Club has practice problems that adapt to your child’s level, each with a detailed explanation and an easy-to-follow video, so your child can build confidence in these skills one step at a time.
Words your child will hear
- hundreds
- Groups of 100. In 706, the 7 means 7 hundreds, or 700.
- tens
- Groups of 10. In 47, the 4 means 4 tens, or 40.
- ones
- Single units. In 47, the 7 means 7 ones.
- place value
- The value a digit has because of its spot in a number: ones, tens, or hundreds.
- digit
- One of the symbols 0 through 9 that we use to write numbers.
- expanded form
- A number written as the sum of its parts, like 400 + 30 + 6 for 436.
- number name
- A number written in words, like four hundred thirty-six.
- compare
- To decide which is more, less, longer, or shorter, and by how much.
Ready to build your child’s confidence with numbers within 1,000?
In Bobby's Math Club, your child practices these skills at just the right level, with a hint when they need one, a clear explanation after every question, and kid-friendly videos. Unlimited practice is free.
Join the club
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.
Which math standards does i-Ready Classroom Mathematics Grade 2 Unit 3 cover?
i-Ready Classroom Mathematics Grade 2 Unit 3 covers these math standards. Each one links to what it means, sample questions, and teaching strategies.
- 2.NBT.A.1: Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones.
- 2.NBT.A.2: Count within 1000; skip-count by 5s, 10s, and 100s.
- 2.NBT.A.3: Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.
- 2.NBT.A.4: Compare two three-digit numbers.
For teachers: Unit names and order vary between editions and districts, so your school’s own materials have the exact sequence. Learn how Bobby's Math Club can help your students grow.