Presentation on theme: "Frigid Fridays On each Friday last January, the temperature was a record low temperature for the date. On Friday, January 30, the mercury dropped to 5°F,"— Presentation transcript:
1 Frigid FridaysOn each Friday last January, the temperature was a record low temperature for the date. On Friday, January 30, the mercury dropped to 5°F, which was 7 degrees higher than the low temperature on the Friday before. The low on January 9 was 2 degrees lower than the low temperature on January 16. On the first Friday of the month, the low temperature was 3 degrees lower than that on January 23. The low temperature on the Friday in the middle of the month was 6 degrees higher than the low temperature on the first Friday. The temperature on the first Friday, January 2nd was -5°F.What was the low temperature reading for each Friday of the month?
2 Solution Date Low Temperature Reading January 2 -5°F January 9 -1°F
6 Rule for subtracting integers To subtract integers, add the opposite.What does this mean?Keep, Change, ChangeKeep the 1st integer the sameChange the subtraction sign to addition.Change the sign of the second integer.Then follow the rules for addition.
7 Let’s try an example.-5 – (-2)keep, change, changeOpposite sign subtract and keep the sign of the larger digit.= -3
8 Let’s try an example -4 – 3 -4 + (-3) keep, change, change Same sign add the integers and keep the sign.-4 + (-3) = -7
9 Example 6 – (-4) Keep, Change, Change 6 + 4 10 Now follow the rules for adding integers!
10 Example -5 – 8 Keep, Change, Change -5 + -8 -13 Now follow the rules for adding integers!
11 Example 18 - 20 Keep, Change, Change 18 + -20 -2 Now follow the rules for adding integers!
12 Time for some practice! -14 -9 – 5 = 27 – (-8) = -3 – (-1) = 35 -8 – 9 =14 – 17 =4 – (-19) =35-2-17-323
13 One more time what is the rule? Add the opposite.Keep, Change, ChangeKeep the 1st integer, Change the sign to addition, Change the 2nd integer.Then follow the rules for adding integers.
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