Using Whole Numbers

By: Tara SpradleyIndicator Project

Science Standard 2 Scientific Thinking

Standard 3.2.1: Add and subtract whole numbers mentally, on paper, and with a calculator

Taken Fromhttp://

dc.doe.in.gov/Standards/AcademicStandards/StandardSearch.aspx

Definitions Add-the process of uniting two or more

numbers into one sum, represented by the symbol +.

Subtract-Mathematics. to take (one number or quantity) from another; deduct.

Whole number-Also called counting number. one of the positive integers or zero; any of the numbers (0, 1, 2,3…).

Taken From http://dictionary.reference.com/browse/whole+number

Background infromation Whole numbers are the numbers you learned when

you were first learning to count - one, two, three, four, five and so on, all the way up to billions and trillions and past that. In addition, zero is a whole number, and so are all the negative numbers: minus 1, minus 2, and so on. There are an infinite number of whole numbers, running along the number line in both directions.

When we measure objects we can round to whole numbers to get an idea or how long the object is.

We can add and subtract small whole numbers in our head, and also on paper, for larger whole numbers we can use a calculator.

Activity Use the tape measure provided to measure the length

of the following objects around your classroom. Round to the nearest whole number to get the

measurement of the objects. Measure the:o The length of the chalkboardo The width of your school desko The length of a pencilo The length of your science booko The length of your own Shoeo The width of the classroom dooro The width of your chair

Activity Write down the measurements of

each item on the chart given.Items Measured

Activity Use the following problems to practice adding and subtracting the whole numbers your came up

with by measuring items around your classroom

Add the Length of a pencil to the length of your science book in your head.

Add the length of your shoe to the width of your chair in your head.

Subtract the width of your school desk from the width of the classroom door on paper.

Subtract the width of the classroom door from the length of the chalkboard on paper.

Activity

Add the length of the chalkboard to the length of a pencil on paper.

Subtract the length of a pencil from the width of your school desk on paper.

Add the length of the chalkboard, the length of a pencil and the width of your chair using a calculator.

Activity

Add the width of your science book, the width of your school desk and the width of the classroom door using a calculator.

Add the width of your chair to the width of your school desk using a calculator.

What other examples can be used when practicing adding and subtracting whole numbers?

Activity Whole numbers can be used in adding and

subtracting when it comes to ages, and amount of time such as hours or months

When you use whole numbers when adding and subtracting you can do small numbers in your head, larger numbers on paper to help yourself keep track of the steps, and if the numbers are really large or there are more than two numbers you can use a calculator

Assessment When subtracting two whole numbers on paper

which whole number goes on top, or first?A.) The smaller numberB.) It doesn’t matterC.) The Larger number

If you have more than two numbers to subtract which method would be easiest to do?

A.) Do the math in your headB.) Do the math on paperC.) Use a calculator to do the math

Assessment

What is the answer to 20+8A.)26B.)28C.)38

What is the answer to 110-35A.)70B.)75C.)85

Assessment

What is the answer to 8+2A.) 6B.)12C.) 10