Section 1.6 Rounding and Estimation

1. Section 1.6 Rounding and Estimation Section 1.6

2. Example • Round 57 to the nearest ten. • Solution • Since 57 is closer to 60, we round up to 60. 50 55 57 60 Section 1.6

3. Another Example: • Round 52 to the nearest ten. • Solution • Since 52 is closer to 50, we round down to 50. 50 55 52 0 Section 1.6

4. Another Example • Round 55 to the nearest ten. • Solution • We agree to round up to 60. 60 50 55 Section 1.6

5. Rounding Whole Numbers • To round to a certain place: • Locate the digit in that place. • Consider the next digit to the right. • If the digit to the right is 5 or higher, round up. If the digit to the right is 4 or lower, round down. • Change all digits to the right of the rounding location to zeros. Section 1.6

6. Examples Round 7564 to the nearest hundred. Solution: Round 88,696 to the nearest ten. Solution: Section 1.6

7. Application Example • Mario and Greta are considering buying a new computer. There are two models, and each has options beyond the basic price, as shown below. Mario and Greta have a budget of $1100. Make a quick estimate to determine if the XS with a monitor, memory upgrade to 750 gig and a printer is within their budget. Section 1.6

8. Inequality Symbols • < means “is less than” • > means “is greater than” • = means “is not equal to” Example: Example: Example: Two inequality signs are missing, do you know what they are? Section 1.6

9. Section 1.7 Solving Equations • A solutionof an equation is a replacement for the variable that makes the equation true. When we find the replacement, we can say the equation is “solved.” • An equation is like a teeter totter. We can perform all kinds of mathematical operations just as long as we keep things balanced. Section 1.7

10. Examples a) b) c) d) Section 1.6