Estimate the sum and difference of the two given numbers by rounding off to nearest 10s and 100s.

__Estimation__

**Estimate the sum and
difference of the two given numbers by rounding off to nearest 10s and 100s.**

Let us round off three numbers 17, 24
and 25 to the nearest 10s.

* We can see that 17 is between 10 and
20 but it is closer to 20 than 10. So, 17 is rounded off to 20.

* 24 is between 20 and 30 but is
closer to 20 than 30. So, 24 is rounded off to 20.

* 25 is between 20 and 30. But it is
exactly on the middle point. So, 25 is rounded off to 30.

We can easily estimate the sum and
difference of any 2 number by rounding off them to nearest values and adding or
subtracting them.

__ __

__Example :__

1. **Estimate the sum
by rounding off to the nearest value and find the actual sum.**

**2. Estimate the
difference by rounding off to the nearest value and find the actual difference.**

__ __

__Practice__

**1. Find the sum and difference of the following.**

**2. Round off the nearest
10.**

**a.**19 __⇒ ~ ____20__

b. 25 __⇒ ~ ____30__

c. 21 __⇒ ~ ____20__

d. 47 __⇒ ~ ____50__

**3. Estimate the sum to the nearest ten and also find the actual
sum.**

**4. Estimate the difference to the nearest ten and also find the
actual difference.**

**Teacher’s note :** The teacher should be
prepared to give a variety of questions, puzzles, and activities according to
the skills of the students.

Tags : Numbers | Term 1 Chapter 2 | 3rd Maths , 3rd Maths : Term 1 Unit 2 : Numbers

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3rd Maths : Term 1 Unit 2 : Numbers : Estimation | Numbers | Term 1 Chapter 2 | 3rd Maths

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