Adding and Subtracting Real Numbers
(Since both numbers are both positive just add) = 12 -3 + (-6) (Since both numbers are negative the answer is a larger negative) -3 + (-6) = - 9
Adding and Subtracting Real Numbers What do you do if opposite signs????? Whatever sign is the larger number, the answer will carry this sign!!!!! 7 + ( -10) Which Number is the larger number? 7 + (-10) Since the -10 is the larger number your answer will be negative 7 – 10 = -3 Because you know the back number is negative subtract Which Number is the larger number? Since the -12 is the larger number your answer will be negative = -8 or rewrite = -8
Adding and Subtracting Real Numbers = 4 or 11 – 7 = 4 (-11) 15 + (-11) = 4 or 15 – 11 = 4 (-3) -5 + (-3) = -8 = - 8 or 7 – 15 = -8
Adding and Subtracting Real Numbers = 4 - 7 – (-3) Every negative after 7 belongs to the 3. One negative sign = a negative (-) sign Two negative signs = a positive sign - 7 – (-3) = = -4 or 3 -7 = -4
Adding and Subtracting Real Numbers 9 – (-6) Every negative after 9 belongs to the 6. How many negative? Is the 6 positive or negative 9 - (-6) = = 15 10 – 12 10 – 12 = -2
Adding and Subtracting Real Numbers -14 – 5 Are both numbers negatives? = -19 7 - (-12) How many negatives does 12 have???? The 12 has two – signs and becomes (positive) 12 = 19 -4 - (-8) How many negatives does 8 have???? Since signs are opposite, which number is larger? = 4 or 8 – 4 = 4
Word Problems Mark is flying in an airplane. The plane is cruising at 5700 feet above sea level. The plane hits turbulance and drops 750 feet before the pilot climbs 300 feet. A. Write an equation showing the math to this problem. B. What height is the plan now?
Word Problems Mark is flying in an airplane. The plane is cruising at 5700 feet above sea level. The plane hits turbulance and drops 750 feet before the pilot climbs 300 feet. A. Write an equation showing the math to this problem. B. What height is the plan now? = 5250 feet
Word Problem Phil is in Minnesota. The temperature is 10 below zero. Over night, the temperature drops another 12 degrees before midnight, and raises 8 degrees before noon. A. Write an equation showing the math to this problem. B. What is the temperature now?
Word Problem Phil is in Minnesota. The temperature is 10 below zero. Over night, the temperature drops another 12 degrees before midnight, and raises 8 degrees before noon. A. Write an equation showing the math to this problem. B. What is the temperature now? = -14 The temperature is now -14 degrees
Word Problem Darnell is scuba diving. He is 400 feet below the his boat when he sees a shark. He swims 100 feet up into a school of fish and then swims 75 feet down to see a sea turtle. A. Write an equation showing the math to this problem. B. How many feet above or below the sea is Darnell?
Word Problem Darnell is scuba diving. He is 400 feet below the his boat when he sees a shark. He swims 100 feet up into a school of fish and then swims 75 feet down to see a sea turtle. A. Write an equation showing the math to this problem. B. How many feet above or below the sea is Darnell? He is 375 feet below sea level or -375
Word Problem Jose has $1250 in his check account. He pays $750 for rent, $125 for his cell phone, $85 for car insurance. He friend Candy pays him $75 for concert tickets. A. Write an equation showing the math to this problem. B. How much money does Jose have in his account?
Word Problem Jose has $1250 in his check account. He pays $750 for rent, $125 for his cell phone, $85 for car insurance. He friend Candy pays him $75 for concert tickets. A. Write an equation showing the math to this problem. 1250 – 750 – B. How much money does Jose have in his account? 1250 – 750 – He has $365 in his account
Adding and Subtracting Real Numbers Practice Problems (-7) (-3) (-7) (-2) (-6) - 8 (-12) (-17)
Adding and Subtracting Real Numbers Practice Problems Answers (-7) = 22 = -5 (-3) = -10 (-7) = 12 = -24 (-2) = 11 = -8 (-6) - 8 = 3 (-12) = 30 (-17) = 4