Place value to 10,000 and beyond
விளையாடிக் கற்றுக்கொள்ளுங்கள்
ஆற்றல் சம்பாதிக்க இந்த கேள்விகளுக்குப் பதிலளியுங்கள், பின்னர் மீன் பிடித்து ஆராயுங்கள். கணக்கு தேவையில்லை.
பாட குறிப்புகள்
What is Place Value?
- Place value means the value of a digit depends on its position (place) in a number.
- In the number 4,321, the digit 4 is in the thousands place, so it means 4,000.
- Each place is worth ten times the place to its right. For example, 1 hundred = 10 tens.
- The Hindu–Arabic numeral system (the one we use) is a base-ten system, using digits 0 to 9.
- Numbers like 10,000 have a 1 in the ten-thousands place and zeros in the other places.
Reading and Writing Numbers
- You can write numbers in numerals (like 5,678) or in words (like five thousand, six hundred seventy-eight).
- Use a comma to separate thousands: 10,000 is ten thousand.
- When writing in words, say the thousands, then the hundreds, then the tens and ones.
- Example: 8,204 is eight thousand, two hundred four.
- Practice with numbers up to 10,000 and beyond, like 12,345.
The Value of Each Digit
- In 3,456, the digit 3 is in the thousands place, so its value is 3,000.
- The digit 4 is in the hundreds place, so its value is 400.
- The digit 5 is in the tens place, so its value is 50.
- The digit 6 is in the ones place, so its value is 6.
- A digit in one place is ten times the same digit in the place to its right. For example, in 2,222, the first 2 is 10 times the second 2.
Comparing and Ordering Numbers
- Use < (less than) and > (greater than) to compare numbers.
- To compare, look at the digits from left to right. The first place where they differ tells you which is bigger.
- Example: 4,567 < 4,657 because 5 < 6 in the hundreds place.
- Order numbers from smallest to largest or largest to smallest.
- Remember: the alligator mouth opens toward the bigger number.
Rounding Numbers
- Rounding means making a number simpler but close in value.
- To round to the nearest 10, look at the ones digit. If it is 5 or more, round up; if 4 or less, round down.
- To round to the nearest 100, look at the tens digit.
- To round to the nearest 1,000, look at the hundreds digit.
- Example: 3,472 rounded to the nearest 100 is 3,500 (because 7 in the tens place is 5 or more).
Counting and Finding More or Less
- You can count in multiples of 10, 100, or 1,000.
- To find 1,000 more than a number, add 1,000. To find 1,000 less, subtract 1,000.
- Example: 1,000 more than 4,500 is 5,500.
- Example: 1,000 less than 8,200 is 7,200.
- Counting in multiples helps you see patterns in place value.
Negative Numbers on a Number Line
- Negative numbers are less than zero, like -5.
- You can see them on a number line to the left of zero.
- An example is temperature: -10°C is colder than 0°C.
- When counting backwards past zero, you go into negative numbers.
- The further left on the number line, the smaller the number.
History of Place Value
- The Babylonians used a base-60 system, which is why we have 60 minutes in an hour.
- The Inca used knots in cords (quipu) to store numbers in a decimal system.
- Roman numerals are not place value; they add values (like CCXXVIII = 228).
- Our base-ten system came from India and spread through Arab mathematicians.
- The decimal point (radix point) lets us write fractions like 3.5.
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பயிற்சி கேள்விகள்
இலவச முன்னோட்டம் — 63-இல் 8 கேள்விகள். அனைத்தையும் பார்க்க பதிவு செய்யவும்.
1.What is the value of the digit 7 in the number 7,342?
Easy- A7
- B70
- C700
- D7,000
2.In the number 5,678, the digit 6 is worth ten times the digit 6 in the number 6,000? (Think about place value.)
EasyTrue or false?
3.Which number is the largest?
Easy- A4,099
- B4,909
- C4,990
4.Put these numbers in order from smallest to largest.
Easy- 3,210
- 3,021
- 3,102
- 3,201
5.Round 3,456 to the nearest hundred.
Medium- A3,400
- B3,500
- C3,450
- D3,000
6.Round 8,721 to the nearest thousand.
Medium- A8,000
- B9,000
- C8,700
- D8,800
7.The number 9,999 is greater than 10,000.
MediumTrue or false?
8.Which of the following numbers are greater than 5,000? (Select all that apply.)
Medium- A4,999
- B5,001
- C5,010
- D4,990
- E5,000
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இந்த தலைப்பிற்கான ஒவ்வொரு கேள்வியையும், ஸ்லைடுகளையும், ஃப்ளாஷ் கார்டுகளையும் மற்றும் திருப்புதல் குறிப்புகளையும் பார்க்க இலவச கணக்கை உருவாக்கவும்.