1 2 3 4 5 ...

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digit:
any of the ten numbers
place value:
The value of a digit related to
its position
1 2 3 4 5 6 7 8 9 0
period:
Each group of three digits
separated by commas in a
multi-digit number
standard form:
A way to write numbers by
using the digits 0 – 9, with each
digit having a place value
expanded form:
A way to write numbers by
showing the value of each
digit separated by plus sign (+)
word form:
One hundred thirty
A way to write numbers by
thousand, two hundred
using words
twenty
517, 893
estimate:
A number close to an exact
amount – a smart guess!
Reasonable:
Makes sense
Round:
5 or above, give it a shove!
To replace a number with
4 or below, let it go!
another number that tells
about how many or how much
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