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Why Does Adding a Trailing Zero Leave a Decimal Unchanged?

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A Peek Beyond the Point · Equivalent and ordered decimals · 3:27

You'll learn: A trailing zero after the last decimal digit adds zero tenths or hundredths, so the value is unchanged.

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Why Does Adding a Trailing Zero Leave a Decimal Unchanged?

3:27

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Why Does Adding a Trailing Zero Leave a Decimal Unchanged?

You'll learn: A trailing zero after the last decimal digit adds zero tenths or hundredths, so the value is unchanged.

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Equivalent and ordered decimals

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Compare and Order Decimals by Place Value
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Compare and Order Decimals by Place Value
You'll learn: Compare decimals place by place from the left to order them.

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Decimals on number lines

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Zoom into a Number Line to Locate a Decimal
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Zoom into a Number Line to Locate a Decimal
You'll learn: Zoom into an interval of the number line again and again to locate a decimal precisely.
Find the Distance Between Two Decimals
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Find the Distance Between Two Decimals
You'll learn: The distance between two decimals is their difference, found on the number line.
Can You Always Find a Decimal Closer to a Target?
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Can You Always Find a Decimal Closer to a Target?
You'll learn: Between any two decimals there is always another, so we can get as close to a target as we like.

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Decimal addition and subtraction

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Regroup to Add and Subtract Decimals
3:15
Regroup to Add and Subtract Decimals
You'll learn: Line up places and regroup across the point to add and subtract decimals.
Find the Next Terms in a Decimal Sequence
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Find the Next Terms in a Decimal Sequence
You'll learn: Find the constant change in a decimal sequence to continue it.
Estimate a Decimal Sum or Difference Before Calculating
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Estimate a Decimal Sum or Difference Before Calculating
You'll learn: Round to whole numbers first to estimate a decimal sum or difference.

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Misleading decimal notation

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Spot Decimal-Point and Unit Errors
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Spot Decimal-Point and Unit Errors
You'll learn: A misplaced point or a mixed unit changes a value by a factor of ten or more; check both.
Why 1.5 Hours, 5.6 Feet and 4.3 Overs Can Mislead
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Why 1.5 Hours, 5.6 Feet and 4.3 Overs Can Mislead
You'll learn: Clock time, feet and inches, and cricket overs group by 60, 12 and 6, not 10, so writing them with a dot like a decimal misleads.

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Simple fractions as decimals

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Write Halves, Quarters and Fifths as Decimals
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Write Halves, Quarters and Fifths as Decimals
You'll learn: Rewrite halves, quarters and fifths with denominators 10 or 100 to get their decimals.
Separate a Decimal's Whole and Fractional Parts
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Separate a Decimal's Whole and Fractional Parts
You'll learn: Every decimal has a whole part and a fractional part separated by the point.

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Letters representing numbers

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How Can a Letter Stand for a Changing or Unknown Number?
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How Can a Letter Stand for a Changing or Unknown Number?
You'll learn: A letter can stand for a quantity that changes or for one we don't know yet.
Describe a Number Relationship with Letters
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Describe a Number Relationship with Letters
You'll learn: Translate a number relationship described in words into an expression with letters.

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Formulas from quantities

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Write a Formula for a Total Cost
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Write a Formula for a Total Cost
You'll learn: Write a formula for total cost as price times quantity.
Express an Age Relationship with a Letter
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Express an Age Relationship with a Letter
You'll learn: Write one person's age in terms of another's using a letter.