Grade 2 · Place Value · MAT-02-PV-001
Count, Read, and Write Numbers to 1000
Count forward and backward within 1000 from varied starting points.
Learning objectives
What you should be able to do
- Count forward and backward within 1000 from varied starting points.
- Read and write three-digit numbers in numeral and word form.
- Use number patterns to identify missing values in sequences.
Prerequisite check
Make sure the foundation is ready.
Checks the Grade 1 numeration base needed to extend to 1000.
Learn
Build the idea from meaning, not memorization.
The counting sequence continues past 120
After 120, the same counting structure continues. Each next whole number is exactly one more than the one before it. Crossing a decade or century changes more digits, but the quantity still increases by one.
Three-digit numerals name hundreds, tens, and ones
A numeral such as 347 records three place-value positions. The left digit counts hundreds, the middle digit counts tens, and the right digit counts ones. Reading the numeral means interpreting those places together.
Word form follows place value
347 is read as three hundred forty-seven. The words reflect the hundreds, then the remaining tens and ones. Zero in a place means there are none of that unit, as in 406: four hundred six.
Patterns make large ranges manageable
Counting by ones changes predictably. At 199, adding one creates 200 because 9 ones regroup to a ten and 9 tens regroup to a hundred. Similar transitions occur at 299, 399, and other century boundaries.
Interactive math lab
Change it. See what stays true.
Base-Ten Lab
Change hundreds, tens, and ones and watch the total rebuild from place value.
- build number
- read model
- cross century
- fill missing sequence
Worked examples
Twenty different ways to see the concept work.
Count on from 121 by four numbers.
121,122,123,124Each step is one more.
Count on from 198.
198,199,200,201The sequence crosses a century boundary correctly.
Count backward from 205.
205,204,203,202Each step is one less.
Read 146.
one hundred forty-sixThe digits show 1 hundred, 4 tens, 6 ones.
Read 309.
three hundred nineZero tens means no tens are named.
Write 'two hundred seventy-four.'
2742 hundreds, 7 tens, 4 ones.
Write 'five hundred eight.'
508There are 5 hundreds, 0 tens, 8 ones.
Which comes after 499?
500One more crosses into the next hundred.
Which comes before 700?
699One less than 700 is 699.
Fill in: 346,347,__,349.
348The numbers increase by one.
Fill in: 600,599,__,597.
598The sequence decreases by one.
Order 412,405,419.
405,412,419Compare hundreds first, then tens and ones.
Which is farther along: 286 or 268?
286Both have 2 hundreds; 8 tens is greater than 6 tens.
Count by hundreds from 100 to 500.
100,200,300,400,500Each step adds one hundred.
Count by tens from 430 to 470.
430,440,450,460,470Each step adds ten.
Read 999.
nine hundred ninety-nineEach place contains 9 units of its type.
What follows 999?
1000One more than 999 is one thousand.
Write 1000 in words.
one thousand1000 represents ten hundreds.
A number has 6 hundreds, 2 tens, 5 ones. Write it.
625Combine the place values.
A number is between 781 and 783. What is it?
782Whole numbers increase by one.
Practice
Guided practice with hints
01Read 256.
Hint: Use hundreds, then tens and ones.
Answer: two hundred fifty-six
02Write 'four hundred twelve.'
Hint: Put 4 in hundreds, 1 in tens, 2 in ones.
Answer: 412
03What comes after 699?
Hint: Add one.
Answer: 700
04What comes before 300?
Hint: Subtract one.
Answer: 299
05Fill in 808,809,__,811.
Hint: Continue by ones.
Answer: 810
06Count by tens: 520,530,__,550.
Hint: Add ten.
Answer: 540
Practice
Independent practice
01Read 431.
Answer: four hundred thirty-one
02Write 'seven hundred six.'
Answer: 706
03What comes after 899?
Answer: 900
04What comes before 501?
Answer: 500
05Fill in 267,268,__,270.
Answer: 269
06Count by hundreds from 300 to 700.
Answer: 300,400,500,600,700
07Order 590,509,559.
Answer: 509,559,590
08Write one thousand as a numeral.
Answer: 1000
Common mistakes
Learn to catch the error, not just the answer.
Zero marks an empty tens place; read it as four hundred six.
Use place-value regrouping: 299 + 1 = 300.
Compare hundreds first because that place has the greatest value.
Applications & challenge
Use the idea beyond a single exercise.
Applications
- Read building, route, or page numbers up to 1000 and identify their place values.
- Track a collection count across a century boundary, such as 198,199,200.
Challenge problems
Explain why 499+1 changes two digits.
9 ones regroup to 1 ten, and 9 tens plus that new ten regroup to 1 hundred.
What number is 1 more than 999?
1000
Find a number greater than 450 but less than 453.
451 or 452
Explain why 508 has no tens even though it has three digits.
The middle digit is 0, so the tens place contains zero tens.
Flashcards
Retrieve it from memory.
Flashcards
Card 1 of 6
Game mode
Number Trail 1000
Move along a number trail by identifying missing, next, previous, and spoken numbers.
Practice
Mastery check
01Read 684.
Answer: six hundred eighty-four
02Write 'three hundred five.'
Answer: 305
03What follows 799?
Answer: 800
04What precedes 600?
Answer: 599
05Fill in 918,919,__,921.
Answer: 920
06Count by hundreds 200 to 600.
Answer: 200,300,400,500,600
07What follows 999?
Answer: 1000
08Explain the zero in 704.
Answer: It shows there are zero tens.
Terminology
Words to know
- three-digit number
- A whole number from 100 through 999 written with hundreds, tens, and ones places.
- hundred
- A group of 100 ones or 10 tens.
- sequence
- Numbers arranged in an order according to a rule.
- place
- A digit position whose value depends on powers of ten.
Continue learning
Connected concepts
Curriculum references
Standards and instructional references
California Common Core State Standards for Mathematics — Grade 2 Number and Operations in Base Ten (2.NBT.A.1–3)
Three-digit numeration and place-value progression.