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Place Value

Place Value. L. Riddler 6 th Grade Mathematics. What is a “ digit ?”. A digit is just one number that is a part of a number A digit can be one of these numbers: 0 1 2 3 4 5 6 7 8 9 Sometimes people call their fingers “digits”

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Place Value

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  1. Place Value L. Riddler 6th Grade Mathematics

  2. What is a “digit?” • A digit is just one number that is a part of a number • A digit can be one of these numbers: 0 1 2 3 4 5 6 7 8 9 • Sometimes people call their fingers “digits” • “Digits” is also a slang word that means telephone number. 936-709-7000

  3. 21 375 7 6,503,211 50 F) 30.7 G) 7,180 H) 70,123.007 I) 911 J) 23, 004 Let’s count the digits in these numbers:

  4. 23 407 1,234 2,200,256 96 F) 67 G) 593 H) 1,000,000 I) 96,301 J) 81 Let’s add the digits in these numbers:

  5. 31.5 300.002 .344567 1,341 45.000001 F) 54,461.0 G) 67.89 H) 111.111 I) 34.05 J) 45.007 Let’s count the number of whole number digits:

  6. 31.5 300.002 .344567 1,341 45.000001 Let’s count the number of decimaldigits: F) 54,461.0 G) 67.89 H) 111.111 I) 34.05 J) 45.007

  7. What is “place value?” • Place value is the amount assigned to a digit. • Some important place values that we will use are: millions, hundred thousands, ten thousands, thousands, hundreds, tens, ones, tenths, and hundredths.

  8. Million Billion Trillion Quadrillion Quintillion Sextillion Septillion Octillion Nonillion Decillion But there are way, way, way more than that. Undecillion Duodecillion Tredecillion Quattuordecillion Quindecillion Sexdecillion Septendecillion Octodecillion Novemdecillion Vigintillion And on and on and on… Googol Googolplex And there is even bigger numbers than that!

  9. We will need to memorize the names of the important place values. Take out a piece of unlined paper. Fold it in half horizontally. Use scissors to cut 10 flaps half way through the paper. Look at the example to label your notes.

  10. Use your foldable notes to help you answer these questions: What is the place value of the digit that is 5? • 345.7 • 6612.654 • 85461 • 34.5 • 3457.07 • 500671.43 • 75403462

  11. Now try to answer these WITHOUT your foldable notes: Name the place value of the digit that is a zero (0). If you are having trouble (there are two or more you CANNOT do on your own), raise your hand to let your teacher know! A) 34012.56 B) 10789541 C) 19780.99 D) 103.867 E) 34.08 F) 456.901 G) 10789 H) 4073429 I) 345601854 J) 50

  12. Activity Break Work on activities that your teacher has selected for you independently or in groups. If you need help with place value, work with the teacher in small group. Do not interrupt the teacher unless you have a really, really, really good reason during small group time.

  13. What can I do with place value? You can use it put numbers in order from least to greatest or greatest to least. You can use it to put numbers into word form. You can use it to put numbers into expanded form.

  14. How do I put numbers in order? Put the following numbers in order from least to greatest: 345.04; 307.04; 511; 307.7; 417.7.

  15. Step One: Find the number with the largest number of digits. 345.04 307.04 511 307.7 417.7 Both of these numbers have 5 digits!

  16. Step Two: Make a Chart This chart has 5 columns because the largest number of digits is 5. It has 5 rows because we are comparing 5 numbers.

  17. Step Three: Line up the Decimals

  18. Step Four: Compare the Digits, Going from the Biggest (left side) to the Smallest (right side) You always read the digits on a number in the same order you read words– from left to right. Middle Smallest Biggest Next to Smallest Next to Biggest

  19. Step Five: Write your numbers in the order that is asked for in the problem. • Least to Greatest = • 307.04 • 307.7 • 345.04 • 417.7 • 511

  20. Put these in order from least to greatest: 717 710 707 700.17 700.07 Put these in order from greatest to least: 1001 1001.5 100 100.5 5001.5 Here are some practice problems that you can use your notes to help with:

  21. Put these in order from greatest to least: 5601 5061 5160 5161 5610 Put these in order least to greatest: 60.1 60.02 61.02 60.01 61 Here are some problems to do without your notes: If you are having trouble (there are two or more you CANNOT do on your own), raise your hand to let your teacher know!

  22. Activity Break Work on activities that your teacher has selected for you independently or in groups. If you need help with ordering numbers, work with the teacher in small group. Do not interrupt the teacher unless you have a really, really, really good reason during small group time.

  23. What is “word form?” It is the way you say the number out loud with all the numbers spelled out. People write numbers in word form when they write a check.

  24. Practice writing these numbers in word form: • 561= five hundred sixty one • 1,342= one thousand three hundred forty two • 1,789,453= one million seven hundred eighty nine thousand four hundred fifty three • 56.45= fifty six and forty five hundredths • 10.6= ten and six tenths

  25. What is “expanded form?” It looks like an addition problem with each digit represented as its own number. Expanded form helps explain why you can carry and borrow when you add and subtract large numbers.

  26. Practice writing these numbers in expanded form: • 617= 600+10+7 • 7,846,567= 7000000+800000+40000+6000+500+60+7 • 6001= 6000+1 • 7801= 7000+800+1 • 6.12= 6+0.1+0.02

  27. Now without your notes, write each number in expanded form and in word form: • 511 • 50 613 • 46.2 • 7 801 678 • 3 445.16 If you are having trouble (there is one or more you CANNOT do on your own), raise your hand to let your teacher know!

  28. Activity Break Work on activities that your teacher has selected for you independently or in groups. If you need help with ordering numbers, work with the teacher in small group. Do not interrupt the teacher unless you have a really, really, really good reason during small group time.

  29. Vocabulary Study Guide Digit Place value Decimal Least Greatest Order Increasing Decreasing Expanded form Word form Standard form

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