Presentation on theme: "This PowerPoint will help you get ready for the test!"— Presentation transcript:
1This PowerPoint will help you get ready for the test! Decimal HelpThis PowerPoint will help you get ready for the test!
2The 9 is in the hundredths spot. 9 X 1/100 = 0.09 Value of a DigitWhat is the digit in question worth? If it’s a three in the tenths place it’s worth three tenths or Write the answer in numerical form.The value of the 9 in is 0.09.Practice:Find the value of the underlined numbers.32.8934.07563.8671.004The 9 is in the hundredths spot. 9 X 1/100 = 0.09
3Value of a Digit Answers = 0.0034.075 = 0.07= 0.81.004 = 0.004
4Writing Decimals Using Expanded Form 22.17 in expanded form isFind the value of each digit and write it one at a time with an addition sign between each one.Practice:Write the following numbers in regular expanded form.If you were to add those numbers up you would get 22.17
5Writing Decimals Using Expanded Form Answers ====
6Expanded Form Using Multiplication Now that you can do regular expanded form, let’s take it a step further. Take each number and decide what you need to multiply by the base number to make it using multiplication.Practice:Write the following numbers in expanded form multiplication.9.185 in expanded form multiplication is(9 X 1) + (1 X 1/10) + (8 X 1/100) + (5 X 1/1000)If you were to multiply what’s in each of the parenthesis and add the products together you would get a sum of
7Expanded Form Using Multiplication Answers = (6 X 10) + (2 X 1) + (7 X 1/10) + (8 x 1/100) + (3 X 1/1000)= (6 X 1) + (5 X 1/10) + (3 X 1/1000)= (1 X 1/10) + (8 X 1/100) + (5 X 1/1000)= (4 X 1) + (8 X 1/10) + (2 X 1/100) + (5 X 1/1000)
8Rounding DecimalsRound the number below to the nearest hundredths place.3.241Locate the number you’re asked to round to. You’ll have to know place value (location) for this. Then, look to the right. My students like to say, “Five and up bump it up. Four and below let it go.” That saying means if the number to the right is a five or higher you bump the number up one digit. If it’s a four or less, you don’t do anything to it. Leave it alone.The Answer is or 3.24Practice:Round the following numbers to the hundredths place.The four is in the hundredths place. The one to the right says, “Leave it alone.” So, it stays a 4.All the numbers to the left of the hundredths place remain the same. The numbers to the right of the hundredths place become zeroes.
9Rounding Decimals Answers = or 7.63= or 12.33= or 30= or 51.07
10Finding the Place Value of the Digit (Aka Location) In class we did a cheer. We said, “Ones, tenths, hundredths, thousandths.”Practice:Name the location of the underlined digit.1 2 3The 2 is in the hundredths place.
11Finding the Place Value of the Digit (Aka Location) Answers = thousandths= tenths= hundredths= hundredths
12Writing Numbers in Word Form The number 456 is four hundred fifty-six. The last spot is thousandths, so my last word is thousandths.Read the numbers to the left of the decimal how you would normally read them. When you see the decimal say, “AND.” Read the numbers to the right of the decimal as a group. Then say the last spot’s name.12.456is twelve AND four hundred fifty-six thousandthsPractice:Write the following numbers in word form.“Last spot last word!”
13Writing Numbers in Word Form Answers = sixty-seven and fifteen thousandths= five hundred twenty-two and four hundredths= seven hundred seventy-one and seven hundred seventy-one thousandths= eighty-four and ninety-seven hundredths
147.2 7.02 Comparing Decimals 7.2 7.02 > >“The alligator eats the biggest number.”7.27.02The number one tip I can give you is to line your decimals up then compare the numbers to determine which number is bigger or smaller.Practice:Compare the two numbers using <, >, or =.They both have sevens, but the tenths place is different. Two is bigger than zero, so 7.2 is the bigger number.
16Creating a Base Ten Block Display of a Decimal You need to be able to recreate a base ten block (10 X 10).58 of the 100 blocks are shaded, so 0.58 is shaded.
17Vocabulary to KnowStandard Form – A way to write numbers by using the digits 0 – 9, with each digit having a place value. E.g., 456Expanded Form – A way to write numbers by showing the value of each digit. E.g., 832 =Word Form – A way to write numbers in standard English. E.g., 4,829 = four thousand eight hundred twenty-nineDigit – Any one of the ten symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, or 9 used to write numbers.