Skill: Subtract from a two-digit number without regrouping informally
Explanation and Free Practice Resources
The learner understands subtraction within 100 as finding the difference between a two-digit quantity and a smaller quantity when each place can be subtracted without exchanging a ten: tens are removed from tens and ones from ones. They can reason with place-value drawings, decomposed numbers, or jumps on a number line, recognizing that the digits represent quantities rather than independent symbols; regrouping, larger numbers, and the standard subtraction algorithm are beyond this understanding.
On this page:
- Learn “Subtract from a two-digit number without regrouping informally” with a detailed explanation of the concept
- Master “Subtract from a two-digit number without regrouping informally” with unlimited, free practice problems
- Download (or modify) a free worksheet on Subtract from a two-digit number without regrouping informally you can use at home or in class with practice problems that scaffold and explore “Subtract from a two-digit number without regrouping informally” from different perspectives.
- Start working on adaptive units like “Addition and Subtraction of Integers - 1 and 2 Digit” or “Base Ten Blocks - Subtraction Intro” that introduce, teach, or practice “Subtract from a two-digit number without regrouping informally” to maximize your learning.
Detailed Explanation: Subtract from a two-digit number without regrouping informally
To subtract, take away the tens first and then take away the ones.
Example:
Think of as 4 tens and 7 ones. Think of as 2 tens and 3 ones.
- Take away tens from tens:
- Take away ones from ones:
- Put the tens and ones left together:
So,
Learn by doing: Subtract from a two-digit number without regrouping informally
Click a topic below to practice the foundational skills you'll need, learn the steps, or master this skill
Your results
Practice with unlimited practice problems
Practice:
Base 10 Blocks - Subtracting - Picture to Answer, No Borrow - Tens and Ones
Earned ?
Download/Modify Free Grade 1 'Subtract from a two-digit number without regrouping informally' Worksheet
Print this free 'Subtract from a two-digit number without regrouping informally' worksheet to practice this skill away from the computer. Click 'Modify' to easily customize this worksheet to your exact needs.
This Worksheet Includes:
- Base 10 Blocks - Subtracting - Picture to Answer, No Borrow - Tens and Ones
- Subtraction - Whole Number 2 x 2, No Borrow
- Base 10 Blocks - Subtracting - Picture (Cross-out) to Equation, No Borrow - Tens and Ones
- Base 10 Blocks - Subtracting - Picture to Equation, No Borrow - Tens and Ones
- Subtraction - Whole Number 2 x 1, No Borrow
- Subtraction - Whole Number - Subtract Multiples of 10
- Subtraction - Whole Number - Subtract Multiple of 10 from a Number - Columns
Units Teaching This Skill
These adaptive units introduce, teach, or reinforce this skill (Subtract from a two-digit number without regrouping informally) through scaffolded problems that grow in difficulty as concepts are understood.