Numbers Beyond 999 Worksheet Page 18
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23Example 11: Round o (a) 43, (b) 87 and (c) 65 to the nearest 10.
Solution:
(a)
43
is rounded o to 40 since the digit in the ones place is 3 which is
less than 4.
(b)
87
is rounded o to 90 since the digit in
Mental Maths
the ones place is 7 which is more than 5.
Round off to the nearest 10.
(c)
65
is rounded o to 70 since the digit in
(a) 68 _____ (b) 82 _____
the ones place is 5.
(c) 94 _____ (d) 55 _____
Rounding off to the nearest 100
To round o a number to the nearest hundred, look at the digit in the tens place.
•
If the digit in the tens place is 4 or less, then place zeroes in the tens and ones place.
The digit in the hundreds place remains the same.
•
If the digit in the tens place is 5 or more, then place zeroes in the tens and ones place.
Add 1 to the digit in the hundreds place.
Example 12: Round o (a) 243 and (b) 1887 to the nearest 100.
Solution:
(a) 243 is rounded o to 200 because the
digit at the tens place is 4.
Mental Maths
(b) 1887 is rounded o to 1900 because the
Round off to the nearest 100.
digit at the tens place is 8.
(a) 497
(b) 8383
(c) 216
(d) 3541
Rounding off to the nearest 1000
To round o a number to the nearest thousand, look at the digit in the hundreds place.
•
If the digit in the hundreds place is 4 or less, then place zeroes in the digits at the
hundreds, tens and ones place. Keep the digit in the thousands place as it is.
•
If the digit in the hundreds place is 5 or more, then place zeroes in the digits at the
hundreds, tens and ones place. Also, add 1 to the digit in the thousands place.
Example 13: Round o (a) 6253 and (b) 7923 to the nearest 1000.
Solution:
(a) 6253 is rounded o to 6000 as the digit
Mental Maths
in the hundreds place is 2.
Round off to the nearest 1000.
(b) 7923 is rounded o to 8000 as the digit
(a) 7249
(b) 1621
in the hundreds place is 9.
(c) 5913
(d) 8469
Even and Odd Numbers
You have already studied that numbers in which we can form pairs are called
even
numbers
and numbers in which we cannot form pairs are
odd
numbers.
For example, 238, 1746, 3280, 7632 are even numbers and 413, 685, 7981, 9377 are odd
numbers.
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