Dazzling Decimals February 17, 2011.

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Presentation transcript:

Dazzling Decimals February 17, 2011

Dazzling Decimals Review Decimal Place Value Compare Decimals Agenda Review Decimal Place Value Compare Decimals Add and Subtract Decimals

Ground Rules You will follow all existing classroom procedures. When you see this icon, you you will write in your index spiral. When you see, “Let’s Go!,” you will clap and say “Calculate” at the same time. You will not take the folder or index spiral out of your homeroom. Your index spiral and folder will become one of your study guides for TCAP.

Let’s Review the Place Value! 2 7 3 4 5 1 9 hundreds tens ones 4/10 tenths 5/100 hundredths What’s next? decimal point

Let’s Go!

Did You Answer Correctly? 2 7 3 4 5 1 9 hundreds tens ones 4/10 tenths 5/100 hundredths 1/1000 Thousandths 9/10,000 Ten Thousandths

You have 3 minutes to copy. Comparing Decimals Numbers to the right of the decimal point are smaller than numbers to the left. Larger Numbers Smaller Numbers

Let’s Investigate! Tenths Place- Takes this ones cube and divides it evenly 10 times. Hundredths Place- Takes this ones cube and divides it evenly 100 times. Thousandths Place- Takes this ones cube and divides it evenly 1000 times. Teacher will shade in the squares that represent each of the red amounts.

Which is greater: 0.6 or 0.58 ?

Hint: One trick is to add a zero to the end of the number so that both numbers are balanced. Then select the higher value. 0.60 0.58 0.6 > 0.58

Which is greater: 0.6 or 0.58 0.6 0.58

Let’s Investigate! Place this on the back of your index card Write down these numbers. 1.045 0.0456 2.05 246 0.04557 .0456 Answer these questions: What number is the largest? 246 What number is the smallest? 0.04557 What numbers are equal? 0.0456 = .0456

Let’s Go!

✔For Understanding Go to your handout and complete the comparing decimals questions 1-10. You will have 5 minutes.

Let’s Check Your teacher will write the correct answers on the board. Please check your work. How many of you got 100%? How many of you got 1 wrong? How many of you got 2 wrong? How many of you got 3 or more wrong?

You have 3 minutes to copy. Adding and Subtracting Decimals Step 1: Line up the decimal points of each number. Step 2: Line up the place values. Step 3: Add or subtract from right to left. Regroup/borrow when necessary.

Place this on the back of your index card. Line up the decimal points. 22.3 + 34.1 56.4 Line up the decimal points. 97.568 - 38.123 59.445

✔For Understanding Go to your handout and complete the Lesson Practice-page 14 (1-8). You will have 12 minutes. Please show your work on the back of the paper.

Let’s Check Your teacher will write the correct answers on the board. Please check your work. How many of you got 100%? How many of you got 1 wrong? How many of you got 2 wrong? How many of you got 3 or more wrong?

Exit Ticket Take out your computer. Log onto http://www.quia.com/profiles/ylewis26 Take the Exit Ticket Quiz titled February 17, 2011_ Decimals Exit Ticket secret word: dazzle 4. There are other activities on this Quia Web site to practice your decimals.