It says "ADD" but sometimes I really subtract.

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Presentation transcript:

It says "ADD" but sometimes I really subtract. Adding Integers It's a trick!! It says "ADD" but sometimes I really subtract. <<< What !?

Warm-Up Order the following from least to greatest: −5, 1, −2, −9 Find the value of each expression. 60.18 + 109.3 7(5.7) 14 ÷ 0.5 -9, -5, -2, 1

Vocab Zero Pair: A positive chip and a negative chip put together. = 0

-5 + 3

-7 + 3 = 1 X 1 X 5 2 X 6 X 2 3 X 7 3 X 4

Example 1 –1 + (– 4) Using integer chips: Using a number line: 6 + (–3)

Adding Integers Determine the sign of the answers. Find the sum. If both are positive, the sum is positive. If both are negative, the sum is negative. If there is one of each, the sum is the sign of the number with the greatest absolute value. Find the sum. If integers have the same sign, add the absolute values and use the sign determined above. If integers have different signs, subtract the lesser absolute value from the greater absolute value and use the sign determined above.

Example 3 Find the value of –5 + (–2) + 1. Find the sum of the first two numbers. –5 + –2 = –7 Add the third number to the sum. –7 + 1 = – 6 –5 + (–2) + 1 = –6

Exit Problems Find the value of each expression. −5 + 2 9 + (−8) −2 + (−10) −1 + (−4) + (−9) 140 + (−122) + (−10)

Communication Prompt Three methods for adding integers were introduced in this lesson (integer chips, number lines or integer rules). Which method do you prefer? Why?