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Place value & decimals
Keep track of what each digit is worth.
A practical starting point
Explore charts, expanded form, rounding and decimals. Visual models connect written digits to units, tens and fractional parts, then carry those ideas into calculations.
Place value & decimals guides
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A little more context
Questions about place value & decimals
Why do trailing decimal zeros not change a value?
A trailing zero adds no amount in that place: 0.5 and 0.50 both represent one half. A zero in the middle of a number can have a different role.
Is rounding an exact answer?
No. Rounding gives an approximation at a chosen precision. Keep the unrounded value when an exact calculation or a later step needs it.