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15 Cards in this Set

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When one of the addends is 1, 2, or 3, count on to find the sum.
5 + 3 = ____
COUNTING ON
When one of the addends is close to 10, first make a ten and then add the rest.
8 + 5 =_____
MAKE A TEN
The process of finding the total number of items when two groups of items are joined. 7 + 3 = 10
ADDITION
Any of the numbers that are added.
example: 2 + 3 = 5
The addends are 2 and 3.
ADDENDS
The process of finding how many are left when a number of items are taken away from a group of items.
SUBTRACTION
When you subtract 1, 2, or 3, count back to find the difference.
5 - 2 = ____
COUNTING BACK
Begin with a smaller number and count up to a larger number.
9 - 7 = ____
COUNTING UP
When you subtract a number from the same number, the difference is zero.
4 - 4 = 0
SAMES
When you subtract zero from a number, the difference is that number.
4 - 0 = 4
ZEROS
The answer in a subtraction problem.
8 - 5 = 3
DIFFERENCE
Operations that undo each other.
6 + 3 = 9, so 9 - 3 = 6
9 x 3 = 27, so 27 - 3 = 9
OPPOSITE OPERATIONS
A set of related addtion and subtraction or multiplication and division number sentences.
FACT FAMILY
To exchange amounts of equal value to rename a number.
23 = 2 tens 3 ones
or 1 ten 13 ones
REGROUP
Rounding numbers to find about how many.
ESTIMATE
When you round a number to the nearest ten, you find the ten that is closest.
ROUND