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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