Rounding Decimals Section 1.2.

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Presentation transcript:

Rounding Decimals Section 1.2

< Getting Started… 1. What is the value of the underlined digit? 784,273.8924 4.56 _______ 4.64 Round 7.528 to the nearest hundredth. Hundred - thousands < 7.53

Lesson 1.2 – Rounding Decimals Used for approximation  Rounding Rules for rounding: 1. Underline the digit in the place value you would like to round 2. Look to the digit to the right, A. If the value is < 5, you will round down. B. If the value is ≥ 5, you will round up.

Examples! Round .357 to the nearest tenth: Round .357 to the nearest hundredth: Round each number to the nearest hundred, then find the sum. 7931 + 467 + 368 + 68 = .4 .36 7900 + 500 + 400 + 100 = 8900

Approximately $90.00 Approximately 34 hours Word Problems! Chun has saved $249.50. He buys a stereo system for $129.99 and a set of headphones for $29.50. To the nearest dollar, how much does Chun have left? Andre worked for 7.6 hours on Monday, 5.75 hours on Tuesday, 6.55 hours on Wednesday, 8.3 hours on Thursday, and 5.55 hours on Friday. To the nearest hour, about how many hours did Andre work on these five days? Approximately $90.00 Approximately 34 hours

NO!!! The total Bill is $20.64! Oops! Grocery Shopping! NO!!! The total Bill is $20.64! Oops! You go to the store with $20.00 to get the following items: Milk: $2.19 Eggs: $1.48 Bread: $1.99 Bacon: $5.49 Hamburger meat: $6.15 Hamburger rolls: $1.25 Apples: $2.09 Round to the nearest dollar. Does she have enough? $19 bill - Yes!

Where are some other places where rounding is not a good idea?

Real- Life Example: http://player.discoveryeducation.com/index.cfm?g uidAssetId=dce85ee4-202e-4284-8c4f- 4ac787b57d16

Homework: Page 14 – 15 4 – 24