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**Accentuate the Negative Investigation 2**

Adding and Subtracting Integers

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**Algorithm – a set of rules for performing a procedure. Ex**

Algorithm – a set of rules for performing a procedure. Ex. When dividing fractions, flip the second fraction and multiply.

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**2.1 Introducing Addition of Integers Chip Model Practice**

Same Signs = -8 1) = ? ADDITION ALGORITHM EXAMPLE Same Signs Add values Keep the sign = 4 = -4 _______ Signs ______ values Keep sign of the ______ number from zero -3 + __ = -2 __ + -1 = 2

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**2.1 Introducing Addition of Integers Chip Model Practice**

Different Signs 1) = ? = 1 2) = ? = -1

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**2.1 Introducing Addition of Integers**

ALGORITHM EXAMPLE Same Signs Add values Keep the sign = 4 = -4 Different Signs Subtract values Keep sign of the farthest number from zero = -2 = 2

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**‘Addition’ Flap of Foldable**

Left side Same Signs Add values Keep the sign Ex = 4 Ex = -12 Right side Different Signs Subtract values Keep the sign of the number farthest from zero. Ex = 1 Ex = -5

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