Subtract Whole Tens from 3-Digit Numbers Without Regrouping

Teaching Notes

Focus on place value to help students easily subtract whole tens from 3-digit numbers without regrouping. Emphasize that only the tens digit changes, while hundreds and ones remain the same.

Vocabulary

Tens place: The position of the tens digit.

Hundreds place: The position of the hundreds digit.

Common Mistakes

• Subtracting from the wrong place value (e.g., ones instead of tens)
• Incorrectly changing the hundreds or ones digit

Differentiation

Discussion Questions

• What happens to the ones digit when we subtract a whole ten?
• How does understanding place value help us subtract these numbers quickly?
• Can you give an example of when we might need to use this skill in real life?

Extension Activities

• Subtract tens on a number line.
• Word problems with tens.

Parent Tip

Ask your child to count backward by tens from a 3-digit number.

Skill Cluster

Number Sense & Operations - Place Value

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Place Value (Hundreds, Tens, Ones)
• Subtracting multiples of 10 from 2-digit numbers

Next Steps

• Subtracting any 2-digit number from a 3-digit number (no regrouping)
• Subtracting whole hundreds from 3-digit numbers
• Subtract 2-digit numbers from 3-digit numbers (no regrouping)
• Subtract whole hundreds from 3-digit numbers
• Subtract whole tens from 3-digit numbers (with regrouping)