102 To The Nearest 10
Rounding off Numbers
Rounding off numbers are discussed hither, where we demand to round a number.Rounding can be washed for every place value of a number.
(i) If nosotros purchase anything and its toll is $12 and 23¢, the cost is rounded upward to it's nearest $ 12 and 23¢ is left.
(two) If we purchase another thing and its cost is $15.78. The cost is rounded up to its nearest $16. 0.22 or 22¢ more is taken.
Similarly, any number is taken to its nearest user-friendly whole number. As 48 is nearer to l than 40, so 48 may be rounded upwardly to 50. This is chosen rounding off the number. In the process of rounding of a number, it is taken to its closest whole number.
Rounding off a number makes it easier to guess the answer in our daily life. It is besides an piece of cake way to check calculations mentally. Look at the number line below and observe how rounding of a number can be washed using the number-line.
11 is closer to 10 than xx. Hence 11 is rounded down to 10. 28 is closer to 30 than 20. Hence 28 is rounded up to 30.
If the given number is between the 2 multiples of ten, it is rounded up to the college multiple. And then v is rounded up to 10.
Note: To round off a number to the nearest tens, we round off information technology to the nearest multiple of ten.
Consider the post-obit examples:
Round off a Number to the Nearest Tens:
i. Round 78 to the nearest multiple of 10.
Solution:
To circular off a number to the nearest tens, we round off it to the nearest multiple of ten.
78 is situated between 70 and 80. The middle of lxx and eighty is 75. 78 is nearer to 80 and farther from 70.
2. Round 53 to its nearest multiple of x.
Solution:
53 is situated betwixt l and lx. The middle number between 50 and threescore is 55.
53 is earlier 55, so it is rounded down to 50.
(When any number is situated one-half manner or in the eye of two convenient whole numbers, it is rounded upwards to the college whole number)
55 is rounded up to 60, 75 is rounded upwards to 80
54 is rounded down to 50, 74 is rounded downwards to 70
3. 37 is rounded up to twoscore because 37 is closer to forty than 30.
Round off a Number to the Nearest Hundreds:
To round off a number to the nearest hundreds, we round off it to the nearest multiple of hundred.
For Example:
225 is nearer to 200 than 300. So, 225 is rounded down to 200.
Round off Number to the Nearest Thousands
To round off number to the nearest thousands, we circular off it to the nearest multiple of one thousand.
For example:
5431 is nearer to 5000 than 6000. So, 5431 is rounded down to 5000.
Questions and Answers on Rounding off Numbers:
I. Round off the following numbers to nearest tens:
(i) 39
(ii) 183
(three) 102
(4) 209
(v) 1268
(vi) 5186
(vii) 9549
(viii) 8911
Answers:
(i) 40
(ii) 180
(iii) 100
(four) 210
(v) 127068
(vi) 5190
(seven) 9550
(viii) 8910
Ii. Round off the following numbers to nearest hundreds:
(i) 3081
(ii) 5232
(three) 4884
(iv) 6012
Answers:
(i) 3100
(ii) 5200
(iii) 4900
(four) 6000
III. Round off the following numbers to nearest thousands:
(i) 4128
(ii) 2854
(iii) 14585
(iv) 27102
Answers:
(i) 4000
(ii) 3000
(iii) 15000
(iv) 27000
Iv.Using number line, round off post-obit numbers to the nearest tens:
(i) Round 72 to the nearest tens.
72 is closer to _______. Hence it is rounded downward to _______.
(ii) Round 39 to the nearest tens.
39 is closer to _______. Hence it is rounded downwardly to _______.
Answer:
4. (i) 72 is closer to 70. Hence information technology is rounded down to 70.
(two) 39 is closer to 40. Hence it is rounded up to twoscore.
V. Circular the given numbers to the nearest tens:
(i) 42
(2) 67
(3) 89
(iv) 47
(5) 56
(vi) 78
Reply:
V.(i) 40
(ii) 70
(iii) 90
(iv) 50
(v) 60
(vi) 80
Related Concept
● Germination of Numbers.
● Finding Out the Numbers
● Names of the Numbers.
● Numbers Showing on Fasten Abacus.
● i Digit Number on Spike Abacus.
● two Digits Number on Spike Abacus.
● iii Digits Number on Spike Abacus.
● 4 Digits Number on Fasten Abacus.
● 5 Digits Number on Spike Abacus.
● Large Number.
● Place Value Chart.
● Identify Value.
● Issues Related to Place Value.
● Expanded form of a Number.
● Standard Class.
● Comparison of Numbers.
● Example on Comparison of Numbers.
● Successor and Predecessor of a Whole Number.
● Arranging Numbers.
● Formation of Numbers with the Given Digits.
● Formation of Greatest and Smallest Numbers.
● Examples on the Formation of Greatest and the Smallest Number.
● Rounding off Numbers.
4th Grade Math Worksheets
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