1-2 Adding and Subtracting Decimals Ex 1.) Steps: 1.) Write the numbers vertically and line up the decimal points. 2.)Add zeros if needed 3.) Add or subtract each place value and bring the decimal point down 4.) Estimate using rounding to see if your answer is reasonable.

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Word Problems 1.) A computer printer weighs lb. The box weighs 2.8 lb and the packing material weighs 0.6 lb. What is the total shipping weight for the printer, box and shipping material? 2.) George weighs 57.5 kg. His body contains 34.9 kg of oxygen and 5.82 kg of hydrogen. The rest is made up of other elements. How many kilograms of other elements are in George's body?

Demonstrate Understanding 1.) ) ) ) ) ) ) ( ) ) ) Mr. Krone's gas tank holds 18.5 gallons when full. If now contains 3.75 gallons. How many gallons will it take to fill the tank?