Counting backward by tens means repeatedly subtracting 10, producing a sequence in which the ones digit remains constant while the tens and hundreds place values change predictably. The sequence can begin at any whole number within 1,000 and may cross a hundred boundary, such as 347, 337, 327; it connects skip-counting to place-value understanding and mental subtraction, without extending to negative numbers or more general integer sequences.
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Detailed Explanation: Count backward by tens
To count backward by tens, subtract each time. The ones digit stays the same, while the tens or hundreds digit changes.
Example: Count backward by tens from .
Subtract again:
Continue:
Notice that the ones digit is always . When we subtract from , we cross from the s to the s:
So, counting backward by tens from gives:
Learn by doing: Count backward by tens
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Count Backwards by 10s - Within 1000
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Download/Modify Free Grade 2 'Count backward by tens' Worksheet
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This Worksheet Includes:
- Count Backwards by 10s - Within 1000
- Count Backwards by 10s - Within 100
- Subtraction - Whole Number - Subtract 10 from a Number
- Count Backwards by 1s - Within 100
- Count Backwards by 1s - Within 1000
- Base 10 Blocks - Counting - Picture to Number - Tens and Ones
- Number Chart to 100 - Next/Previous Number (one, below 100)
Units Teaching This Skill
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