Complete 1000 with Hundreds (220)

Teaching Notes

Important benchmark number skill. 1,000 is a key reference point in our number system. Strategy: Ask "How many hundreds make 10?" Connect to making tens (7+3=10), just with hundreds. Real-world: saving money to reach $1,000.

Vocabulary

Thousand: Ten hundreds make one thousand.

Missing Addend: The number needed to reach a sum.

Common Mistakes

• Not understanding that 10 hundreds = 1 thousand
• Writing 100 instead of necessary amount
• Confusing with completing to 100
• Not seeing connection to making tens
• Not recognizing the value of a hundred (e.g., thinking 300 + 7 = 1000 instead of 300 + 700 = 1000).
• Miscounting when skip-counting by 100s.
• Difficulty with mental math without visual aids.

Differentiation

Discussion Questions

• How many hundreds are there in 1,000?
• If you have 400, what multiple of 100 do you need to add to reach 1,000?
• How is completing 1000 with hundreds similar to completing 10 with ones?

Extension Activities

• Make 1,000 with hundreds.
• Count down from 1,000.
• Add hundreds to reach 2,000.

Parent Tip

Use blocks or coins to represent hundreds and count up to 1,000.

Skill Cluster

Number Sense & Place Value

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Counting by 100s to 1000
• Understanding place value (hundreds, tens, ones)
• Basic addition/subtraction within 100

Next Steps

• Adding/subtracting multiples of 100
• Adding 3-digit numbers (without regrouping hundreds)
• Mental math strategies for addition within 1000
• Adding and Subtracting Multiples of 100
• Place Value with 3-Digit Numbers
• Making 100 with Tens