By: Tara Spradley Indicator Project.  Standard 3.2.1: Add and subtract whole numbers mentally, on paper, and with a calculator  Taken From

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Presentation transcript:

By: Tara Spradley Indicator Project

 Standard 3.2.1: Add and subtract whole numbers mentally, on paper, and with a calculator  Taken From Standards/StandardSearch.aspx

 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…).counting number.  Taken From number

 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.infinite  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.

 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 chalkboard o The width of your school desk o The length of a pencil o The length of your science book o The length of your own Shoe o The width of the classroom door o The width of your chair

 Write down the measurements of each item on the chart given. Items Measured

 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.

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.

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?

 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

 When subtracting two whole numbers on paper which whole number goes on top, or first? A.) The smaller number B.) It doesn’t matter C.) 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 head B.) Do the math on paper C.) Use a calculator to do the math

What is the answer to 20+8 A.)26 B.)28 C.)38 What is the answer to A.)70 B.)75 C.)85

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