2. Rounding off in Tens
Rounding off in Tens is to replace a
number with a number that tells how
close it is to the nearest ten.
Example:
20 21 22 23 24 25 26 27 28 29 30
27 is closer to 30, so we would round it to
30!
3. We are rounding to the Tens place,
so we are going to circle the number
in the Tens place.
2 3 7 5
Move to the right,
Underline next number
2, 3 7 5
4. If underlined number is 0 to 4,
Circle stays the same
2 , 3 7 5
If it is 5 to 9,
Add 1 in circled number. 7+1 = 8
Digits to the right change to ZERO
2 , 3 8 0
5. We are rounding to the Hundred place,
so we are going to circle the number in
the Hundred place.
2 3 7 5
Move to the right,
Underline next number
2 , 3 7 5
6. If underlined number is 0 to 4,
Circle stays the same
2 , 3 7 5
If it is 5 to 9,
Add 1 in circled number. 3+1 = 4
Digits to the right change to ZERO
2 , 4 0 0
7. Rounding to the Thousands place,
so we are going to circle the number in
the Thousand place.
2 3 7 5
Move to the right,
Underline next number
2 , 3 7 5
8. If underlined number is 0 to 4,
Circle stays the same
2 , 3 7 5
Digits to the right change to ZERO
2 , 4 0 0
10. Round off the fol owing numbers to the
indicated place value.
Nearest Thousands
1) 78 125
2) 51 789
3) 25 507
4) 6 895
5) 27 023
11. Round off the fol owing numbers to the
indicated place value.
Nearest Hundred Thousands
1) 8 562 902
2) 5 124 900
3) 12 578 124
4) 9 876 540
5) 567 810
12. Round off the following numbers to the
indicated place value.
Nearest Millions
1) 14 568 140
2) 29 128 035
3) 50 671 904
4) 47 132 090
5) 1 452 907
13.
14. 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
zeros
“How do we round numbers?
15. Question Time
Round to the nearest 10
1. 534
2. 6721
Round to the nearest 100
1. 534
2. 6721
Round to the nearest 1000
1. 534
2. 6721
16. Assignment:
On page 27 of your book, answer 1 – 15
For numbers 1-3, use the number line
below to round off each number.
Round off each amount to the nearest
hundred thousand pesos
Round off each number to the nearest
millions
Round off each number to the nearest ten
billions.
