When adding one-digit numbers, add the digits in the one's place
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Addition
Front
Combine numbers together to make a bigger number
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Dozen
Front
12 items in a package
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Sum
Front
the total when you add numbers
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Place value
Front
The value of a digit based upon it's position in a number
Back
Two-digit addion
Front
When adding two-digit numbers line up the ones and the tens places together. Add the ones places together and then add the tens place together.
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Subtraction
Front
take away from a number to make it smaller
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Regrouping
Front
If a sum in the ones or tens place is greater than ten, regroup the sum to make it one unit, then add it to the next place value
Back
Joining
Front
an addition word
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Leaving
Front
a subtraction word
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Three-digit addition
Front
When adding three-digit numbers, line up the ones, tens and hundreds places. Then, add the ones together, add the tens together, and add the hundreds together.