Learning Objectives
- Read and write numbers up to 1000
- Understand place value of ones, tens, and hundreds
- Compare numbers using greater than, less than, and equal to
- Arrange numbers in ascending and descending order
- Skip counting by 2s, 5s, 10s, and 100s
Key Concepts
Place Value
Every digit in a number has a place value. In the number 365, the digit 3 is in the hundreds place and its value is 300. The digit 6 is in the tens place and its value is 60. The digit 5 is in the ones place and its value is 5. So 365 = 300 + 60 + 5.
Comparing Numbers
To compare two numbers, first look at the number of digits. A number with more digits is always bigger. If both numbers have the same number of digits, compare the leftmost digit first. For example, 456 is greater than 389 because 4 is greater than 3 in the hundreds place.
Ordering Numbers
Ascending order means arranging numbers from smallest to largest, like climbing up stairs. For example: 123, 234, 345, 456. Descending order means arranging from largest to smallest, like going down stairs. For example: 456, 345, 234, 123.
Skip Counting
Skip counting means jumping over numbers in a pattern. Counting by 2s: 2, 4, 6, 8, 10... Counting by 5s: 5, 10, 15, 20, 25... Counting by 10s: 10, 20, 30, 40, 50... Counting by 100s: 100, 200, 300, 400, 500...
Important Terms
- Place Value: The value of a digit based on where it sits in the number
- Ascending Order: Numbers arranged from smallest to largest
- Descending Order: Numbers arranged from largest to smallest
- Skip Counting: Counting forward by jumping a fixed number each time
- Digit: The symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 used to write numbers
Quick Revision
- The smallest 3-digit number is 100 and the largest is 999
- Place values are: Ones, Tens, Hundreds
- 365 = 3 hundreds + 6 tens + 5 ones
- Use place value to compare numbers
- Skip counting helps you count faster
- Even numbers end in 0, 2, 4, 6, or 8