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1.4 In the Chips Using a Chip Model To solve a problem using a chip board: Display 1 st # of number sentence onto chip board. Add or remove chips to represent 2 nd # of number sentence. (if chips need to be removed from the board but their aren’t enough there, chips must be added in the form of zero pairs) Remove the zero pairs from chip board. The chips remaining on the board represent the answer. Negative Positive 1 Red Chip + 1 Black Chip = a “Zero Pair”

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1.4 Practice Display 1st # of number sentence onto chip board. Add chips to represent 2nd # of number sentence. Remove the zero pairs from chip board. The chips remaining on the board represent the answer = ?

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1.4 Practice Display 1st # of number sentence onto chip board. Add chips to represent 2nd # of number sentence. Remove the zero pairs from chip board. The chips remaining on the board represent the answer = ?

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1.4 Practice Display 1st # of number sentence onto chip board. Subtract chips to represent 2nd # of number sentence. Since there are no zero pairs, -1 is the answer = ? Subtract 2

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Remove chips to represent 2nd # of number sentence. Only 2 chips are there, so 1 zero pair must be added. 1.4 Practice Then, the 3 red can be subtracted. Display 1st # of number sentence onto chip board. Since there are no zero pairs, one is the answer. 1 2a 2b = ?

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Remove chips to represent 2nd # of number sentence. Only 4 chips are there, so 3 zero pairs must be added. 1.4 Practice Then, the 7 black can be subtracted. Display 1st # of number sentence onto chip board. Since there are no zero pairs, negative three is the answer. 1 2a 2b 3 Subtract = ?

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Remove chips to represent 2nd # of number sentence. Only 2 chips are there, so 1 zero pair must be added. 1.4 Practice Then, the 3 red can be subtracted. Display 1st # of number sentence onto chip board. Since there are no zero pairs, two is the answer. 1 2a 2b 3

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