Learning Objectives
● To know the rounding of decimal numbers.
● To understand the four fundamental operations on decimal numbers.

__Chapter 1__

__NUMBER SYSTEM__

** **

**Learning Objectives**

● To know the rounding of decimal numbers.

● To understand the four fundamental
operations on decimal numbers.

** **

**Recap-Decimal numbers**

We have studied about decimal numbers
in the previous term. Let us recall them now by answering the following questions.

** **

**Try these**

**1. Represent the fraction 1/4 in decimal form.**

**Solution: **

1/4 = [1 × 25] / [4 × 25] = 25 / 100 = 0.25

**2. What is the place value of 5 in 63.2 57.**

**Solution: **

Place value of 5 in 63.257 is 5 hundredths (Hundreth place)

**3. Identify the digit in the tenth place of 75.036.**

**Solution: **0

**4. Express the decimal number 3.75 as a fraction.**

**Solution: **3.75 = 375 / 100 = 15 / 4

**5. Write the decimal number for the fraction 5 (1/5).**

**Solution: **5( 1/5) = 26 / 5 = [ 26 × 2 ] / [ 5 × 2 ] = 52 / 10 =
5.2

**6. Identify the bigger number : 0.567 or 0.576.**

**Solution: ** Comparing the digits of
0.567 and 0.576 from left to right, we have the tenths place same comparing the
hundredths place 7 > 6.

=> 0.576 > 0.567

**7. Compare 3.30 and 3.03 and identify the smaller number.**

**Solution: ** The whole number is equal
in both the numbers.

Now comparing the tenths place we have 3 > 0

=> 3.03 < 3,30 Smaller number is 3.03

**8. Put the appropriate sign (<, >, =). 2.57 ___ 2.570**

**Solution: ** 2.57 **=**
2.570

**9. Arrange the following decimal numbers in ascending order. 5.14,
5.41, 1.54, 1.45, 4.15, 4.51.**

**Solution: ** Comparing the numbers from left to right.
Ascending order : 1.45, 1.54. 4.15, 4.51, 5.14, 5.41

__Introduction__

Mani went to market to purchase vegetables.
The price details of five different vegetables on that day are shown in the following
table.

● Mani wanted to round of each price
to the nearest rupees.

● How will you decide on rounding each
number?

Tags : Term 3 Chapter 1 | 7th Maths , 7th Maths : Term 3 Unit 1 : Number System

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7th Maths : Term 3 Unit 1 : Number System : Number System | Term 3 Chapter 1 | 7th Maths

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