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Read the following numbers.
• 18, 453
• 9, 009, 370
•570, 045
• 4, 90,1 067
Can you guess the exact number of
people in the picture?
Rounding-off
Numbers
Rounding means making
a number simpler but keeping its
value close to what it was. The
result is less accurate, but easier to
use.
The Rounding Poem
Find your number.
Look right next door.
4 or less just ignore.
5 or more, add 1 more.
Find the place value and
circle that digit
2,372
We are rounding to the hundreds place,
so we are going to circle the number in the hundreds place.
Move to the right,
underline the number
Look to the right of the number that is circled.
The place value next to the hundreds place is the tens place.
Underline the number in the tens place.
2,372
0 through 4,
Circle stays the same
If the number underlined is 0, 1, 2, 3, 0r 4,
leave the number in the circle alone.
The number underlined is a 7,
so this step does not apply.
2,372
5 through 9,
Add 1
If the number underlined is 5, 6, 7, 8, 0r 9
add 1 to the number in the circle.
The number underlined is a 7,
so add 1 to the number in the circle.
3 + 1 = 4
2,472
Now flex your muscles like a hero,
Digits to the right change to ZERO
All the digits to the right of the number in the circle,
change to ZERO.
The tens place and the ones place
are to the RIGHT of the hundreds place.
So, the 7 and the 2 both changed to ZERO.
2,400
We just rounded 2,372 to the nearest hundred.
The nearest hundred is 2,400.
2,300 2,4002,350
2,372
x
2,372 is closer to 2,400 rather than 2,300.
How do we round numbers?
To round off a whole number to a
specified place value, determine the digit
to the right of the place you are rounding
off to.
If the digit is 5,6,7,8,and 9, round
it up or simply add 1 to the digit in the
specified place and replace the digits
to the right with zeros.
If the digit is less than 5
(4,3,2,1,and 0) retain the digits in
the specified place and
replace/change the digits to the
right with zero
Assignment:
Round off to nearest Ten Thousands the
ff. numbers.
1) 781 000
2) 2 342 670
3) 54 671
4) 63 421
5) 241 584
Roundinng off numbers

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Roundinng off numbers

  • 1. Read the following numbers. • 18, 453 • 9, 009, 370 •570, 045 • 4, 90,1 067
  • 2. Can you guess the exact number of people in the picture?
  • 4. Rounding means making a number simpler but keeping its value close to what it was. The result is less accurate, but easier to use.
  • 5. The Rounding Poem Find your number. Look right next door. 4 or less just ignore. 5 or more, add 1 more.
  • 6. Find the place value and circle that digit 2,372 We are rounding to the hundreds place, so we are going to circle the number in the hundreds place.
  • 7. Move to the right, underline the number Look to the right of the number that is circled. The place value next to the hundreds place is the tens place. Underline the number in the tens place. 2,372
  • 8. 0 through 4, Circle stays the same If the number underlined is 0, 1, 2, 3, 0r 4, leave the number in the circle alone. The number underlined is a 7, so this step does not apply. 2,372
  • 9. 5 through 9, Add 1 If the number underlined is 5, 6, 7, 8, 0r 9 add 1 to the number in the circle. The number underlined is a 7, so add 1 to the number in the circle. 3 + 1 = 4 2,472
  • 10. Now flex your muscles like a hero, Digits to the right change to ZERO All the digits to the right of the number in the circle, change to ZERO. The tens place and the ones place are to the RIGHT of the hundreds place. So, the 7 and the 2 both changed to ZERO. 2,400
  • 11. We just rounded 2,372 to the nearest hundred. The nearest hundred is 2,400. 2,300 2,4002,350 2,372 x 2,372 is closer to 2,400 rather than 2,300.
  • 12. How do we round numbers? To round off a whole number to a specified place value, determine the digit to the right of the place you are rounding off to.
  • 13. If the digit is 5,6,7,8,and 9, round it up or simply add 1 to the digit in the specified place and replace the digits to the right with zeros.
  • 14. If the digit is less than 5 (4,3,2,1,and 0) retain the digits in the specified place and replace/change the digits to the right with zero
  • 15. Assignment: Round off to nearest Ten Thousands the ff. numbers. 1) 781 000 2) 2 342 670 3) 54 671 4) 63 421 5) 241 584

Editor's Notes

  1. Call on students to tell me the value of all the digits in this number. Review place value.
  2. Common error students make: Clarify that we are changing the number in the circle NOT the number that we underlined. Explain that we are rounding to the nearest hundred, so we are changing the hundreds place NOT the tens place.
  3. Explain to students that we are looking to round the number to the NEAREST (CLOSEST) hundred. So, we are finding the closest hundred to 372. When we round, we are using numbers that are easier to work with.
  4. Rounding Rap makes it easy to find the closest hundred. We can use Rounding Rap to help us round whole numbers. We will practice rapping together as a class. I usually tie a bandana around my head and pretend that I am rapping into a microphone. I also walk around the room making rapping sounds. The students really get a kick out of this and we have a lot of fun while learning how to round!