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1st Grade Math
10. 1.NBT.B.2
10.3 Numeral expanding up to 99
Numeral Expanding Up to 99
Discover how to break down any two-digit number into tens and ones and write it in expanded form with simple, step-by-step examples.
What You'll Learn
Identify the tens digit and the ones digit inside any two-digit number.
Write a number in expanded form as \( 10 \times t + o \), where \(t\) is the tens digit and \(o\) is the ones digit.
Break a number like \(47\) into \(40\) and \(7\) to show what each digit is really worth.
Rebuild a standard number from its expanded parts by adding the tens value and the ones value.
Use expanded form to compare numbers by lining up their tens and ones values side by side.
What You'll Practice
1
Writing numbers from word form descriptions of tens and ones
2
Breaking two-digit numbers into their place value components
3
Adding tens and ones to form complete numbers
Why This Matters
Understanding place value and number expansion builds the foundation for all arithmetic operations. This skill helps you add, subtract, and understand larger numbers throughout your math education and everyday tasks like counting money.
This Unit Includes
1 Video lesson
Practice exercises
Learning resources
Skills
Place Value
Tens and Ones
Number Sense
Expanded Form
Two-Digit Numbers
OH Curriculum Aligned