8/31 Warmups 1.What is 8 + (–30)? 2.What is –25 + (–30)? 3.On a cold day, Rupert measured the outside temperature and discovered it was 13°F. Each hour.

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Presentation transcript:

8/31 Warmups 1.What is 8 + (–30)? 2.What is –25 + (–30)? 3.On a cold day, Rupert measured the outside temperature and discovered it was 13°F. Each hour after that, Rupert measured the outside temperature and discovered it was 3°F colder than the previous hour’s temperature. At this rate, how many hours would it take for the temperature to reach –17°F?

Section 1.3: Subtracting Integers

Subtracting Integers: The Big Idea Seventh grade definition of subtraction: To subtract an integer, add its opposite. For example: 10 – 12 is equal to 10 + (–12).

How to Subtract How toExample 5 – 8 Try It Yourself 1. 3 – – – 140

How to Subtract, Second Example: How toExample – 4 – 6 Try It Yourself 1. – 2 – 102. – 5 – 203. – 30 – 120

How to Subtract, Third Example: How toExample 6 – (– 6) Try It Yourself 1. 4 – (– 6)2. 7 – (–10)3. 70 – (–100)

How to Subtract, Last Example: How toExample – 2 – (– 3) Try It Yourself 1. – 3 – (– 5)2. – 9 – (–9)3. – 32 – (– 40)

Practice 1.10 – 23 2.– 12 – – (–11) 8.– 4 – 5 9.– 12 – (–7) 10. – 9 – (–8)