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8-1-11
 

8-1-11

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    8-1-11 8-1-11 Presentation Transcript

    • Monday August 1, 2011 Hubbs Center - Math 2 Agenda and Objectives
    • Today’s objectives...• We will review: – converting fractions to decimals – finding equivalent decimals• We will practice and discuss comparing decimals.
    • Review:Converting Fractions to Decimals• Sometimes you can change the denominator of a fraction to be10, 100, or 1,000 to make it easier to convert to a decimal.• Example: 1/5 – What could we multiply x 5 to get 10? 2. – Multiply the numerator and denominator by 2. So, 1 x 2 = 2, 5 x 2 = 10. – The new fraction says 2/10. – 2/10 Two tenths 0.2
    • Review:Converting Fractions to Decimals• Now try the same method with these fractions:*Remember, try to get the denominator to be 10, 100, or 1,000. – 1/50 – 3/20
    • Review:Converting Fractions to Decimals
    • Review: Finding Equivalent Decimals• Homework: page 87• Let’s go around the room and share our answers for #1-11.• If you don’t want to share, you can say “pass”.
    • Review: Finding Equivalent DecimalsWord problem: Exploring Equivalent Decimals
    • Review: Finding Equivalent Decimals
    • Comparing Decimal Numbers Put the following numbers in order from Greatest ------ Least. 1. 543, 341, 978 2. 751, 572, 321 3. 235, 313, 413 4. 451, 223, 571, 121http://www.curriki.org/xwiki/bin/view/Coll_NaomiRodriguez/ComparingDecimalNumbers
    • Comparing Decimal Numbers• What is a number between 0 and 2?• What is a number between 1 and 2?• What is a number between 1.5 and 2?• Let’s make a number line to show where those numbers are.
    • Comparing Decimal Numbers• What is a number between 0 and 0.1?• What is a number between 0.1 and 0.2?• What is a number between 0.15 and 0.2?• Let’s make a number line to show where those numbers are.
    • Comparing Decimal Numbers• Use your decimal place value sheet to help you compare: 0.2_________0.02 1.0_________0.1 0.5_________0.2• Rules for Comparing Decimals: Line the numbers up, one below the other. Line up the decimal points to be sure all of the place values are lined up. Start at the left and work to the right. Compare one column at a time.
    • Comparing Decimal Numbers• Rules for Comparing Decimals: Line the numbers up, one below the other. Line up the decimal points to be sure all of the place values are lined up. Start at the left and work to the right. Compare one column at a time.• Examples: 0. 5 Compare 0.5 and 0.289 0. 2 8 9 5 tenths is greater than 2 tenths. 0.5 > 0.289 Compare 0.882 and 0.89 0. 8 8 2 8 hundredths is less than 9 hundredths. 0. 8 9 0.882 < 0.89
    • Homework:Comparing Decimal Numbers• Page 88• Page 70