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# Adding and Subtracting Whole Numbers - PowerPoint PPT Presentation

Adding and Subtracting Whole Numbers. Section 1.2. Objectives. Find the sum of two or more whole numbers Find the difference of two whole numbers Estimate the sum or difference of whole numbers Find the perimeter of a polygon. Objective 1: Find the sum of two or more whole numbers.

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Presentation Transcript

### Adding and Subtracting Whole Numbers

Section 1.2

Objectives
• Find the sum of two or more whole numbers
• Find the difference of two whole numbers
• Estimate the sum or difference of whole numbers
• Find the perimeter of a polygon

### Objective 1:Find the sum of two or more whole numbers

Objective 1
• Sum is the result of adding
• Write numbers in columns so place values are lined up
• Add each column, starting with the ones (or units) column
• If sum of column is greater than 9, write the ones digit and carry the tens digit to next column

### Objective 2:Find the difference of two whole numbers

Objective 2
• To subtract whole numbers
• Write numbers in a column so place values are lined up
• Subtract in each column, starting with one (or units) column
• When numbers in a column can’t be subtracted, borrow 1 from next column and rename by adding 10 to upper digit, then subtract
• When exercise is worded “Subtract A from B,” you must reverse the order: B – A.

### Objective 3:Estimate the sum or difference of whole numbers

Objective 3
• Estimate by rounding numbers to a specified place and add or subtract

### Objective 4:Find the perimeter of a polygon

Objective 4
• Polygon is a closed figure whose sides are line segments
• Perimeter of a polygon is the distance around the outside
• To find perimeter, add the lengths of the sides
• Objective: Solve an equation of the form

x + a = b, or x – a = b, where a, b, and x are whole numbers