Adding Integers. Adding Integers with the Same Sign Add the absolute values. The sum will have the same sign as the addends. Example 1 Find –2 + (-3)

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Presentation transcript:

Adding Integers

Adding Integers with the Same Sign Add the absolute values. The sum will have the same sign as the addends. Example 1 Find –2 + (-3)

Adding Integers Adding Integers with the Same Sign Add the absolute values. The sum will have the same sign as the addends. Example 1 Find –2 + (-3) Start at zero. Move 2 units to the left. Then, move 3 more units to the left.

Adding Integers Adding Integers with the Same Sign Add the absolute values. The sum will have the same sign as the addends. Example 1 Find –2 + (-3) Start at zero. Move 2 units to the left. Then, move 3 more units to the left. –2 + (-3) = -5

Adding Integers Adding Integers with Different Sign Subtract the absolute values of the integers. The difference will have the same sign of the integer with the greater absolute value. Example 2 Find –4 + 5

Adding Integers Adding Integers with Different Sign Subtract the absolute values of the integers. The difference will have the same sign of the integer with the greater absolute value. Example 2 Find –4 + 5 Start at zero. Move 4 units to the left. From there, move 5 units to the right.

Adding Integers Adding Integers with Different Sign Subtract the absolute values of the integers. The difference will have the same sign of the integer with the greater absolute value. Example 2 Find –4 + 5 Start at zero. Move 4 units to the left. From there, move 5 units to the right. –4 + 5 = 1

Adding Integers Adding Integers with Different Sign Subtract the absolute values of the integers. The difference will have the same sign of the integer with the greater absolute value. Example 3 Solve x = 10 + (-4) + (-7).

Adding Integers Adding Integers with Different Sign Subtract the absolute values of the integers. The difference will have the same sign of the integer with the greater absolute value. Example 3 Solve x = 10 + (-4) + (-7). x = 10 + (-4) + (-7) Add –4 and –7.

Adding Integers Adding Integers with Different Sign Subtract the absolute values of the integers. The difference will have the same sign of the integer with the greater absolute value. Example 3 Solve x = 10 + (-4) + (-7). x = 10 + (-4) + (-7) = 10 + (-11) Add –4 and –7. Subtract absolute values.

Adding Integers Adding Integers with Different Sign Subtract the absolute values of the integers. The difference will have the same sign of the integer with the greater absolute value. Example 3 Solve x = 10 + (-4) + (-7). x = 10 + (-4) + (-7) = 10 + (-11) = -1 Add –4 and –7. Subtract absolute values. The result is negative because |-11| > |10|.

Adding Integers Rules to Remember: Same Sign - keep the sign and Add Opposite Signs – keep the sign of the larger number and subtract (Big number does the talking)