When we plot these numbers on a number line us observe that12 lies between 10 and 20. Likewise 12 is nearest to 10 than 20. So, we round off12 together 10, correct to the nearest tens.

If we consider 19, us observe the it is nearer to 20 than10. So, us round off 19 to 20, correct to the nearest tens.

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Now, allow us think about the number 15. If us plot this number ~ above number line we find that 15 lieshalf-way between 10 and 20. By convention, we round off 15 come 20.

Now we will certainly learn how to estimate the number 23, 27 and also 29. Look at the arrowhead at 23. The is nearer come 20 than 30 because23 - 20 = 3 while 30 – 23 = 7. We take 23 as 20 when we calculation it to thenearest 10. Again, look in ~ the arrow at 27. The arrow at 27 is nearer to30 보다 20 due to the fact that 30 – 27 = 3 and also 27 – 20 = 7. So, 27 is taken as 30. In the very same way, look in ~ the arrow at 29. That is nearer to 30than 20 because 30 - 29 = 1 if 29 – 20 = 9. So, 29 is taken as 30 due to the fact that itis close to to 30 보다 20.

How will we round off the number 25?

25 is equal street from 20 and also 30. By convention it istaken together 30.

1. Round off to thenearest tens:

(i) 362

The offered number is 362.

Its ones or unit digit is 2, i m sorry is much less than 5. So, wereplace the ones number by 0 to gain the rounded off number.

Hence, rounded turn off number = 360.

(ii) 909

The offered number is 909.

Its ones or unit digit is 9, i m sorry is better than 5. So, weincrease the tens digit by 1 and replace the ones digit by 0 to gain the roundedoff number.

Hence, rounded off number = 910.

2. exactly how toestimate 2534 come the nearest 10?

34 is nearer to 30 than 40, so 2534 is taken as 2530.

From the over examples, to calculation to nearest tens we cangeneralize that,

(i) the numbers having 1, 2, 3, 4 in ~ ones or units ar arerounded off downwards.

(ii) the numbers having actually 5, 6, 7, 8, 9 at ones or systems placeare rounded turn off upwards.

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