Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 1 Number System Intext Questions
Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 1 Number System Intext Questions
Tamilnadu Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 1 Number System Intext Questions
Exercise 1.1
Try These (Text book Page No. 1)
Question 1.
Represent the fraction 1/4 in decimal form
Question 6.
Identify the biggest number : 0.567 and 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
Question 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
Question 8.
Put the appropriate sign (<, >, =). 2.57 [ ] 2.570
Solution:
2.57 [=] 2.570
Question 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
Exercise 1.2
Try These (Text book Page No. 6)
Question 1.
Find the following using grid models:
(i) 0.83 + 0.04
(ii) 0.35 – 0.09
Shading the regions 0.35 by shading 35 boxes out of 100. Striking off 9 boxes out of 35 shaded boxes to subtract 0.09 from 0.35.
The left over shaded boxes represent the required value.
∴ 0.35 – 0.09 = 0.26
Try These (Text book Page No. 7)
Question 1.
Using the area models solve the following
(i) 1.2 + 3.5
(ii) 3.5 – 2.3
Solution:
(i) 1.2 + 3.5
Here 1.2 is represented in blue colour and 3.5 is represented in Green colour. Sum of 1.2 and 3.5 is 4.7.
(ii) 3.5 – 2.3
Representing 3.5 using 3 squares and 5 rectangular strips. Crossing out 2 squares from 3 squares and 3 rectangular strips from 5 to get the difference. So 3.5 – 2.3 = 1.2.
Try These (Text book Page No. 9)
Question 1.
Complete the magic square in such a way that rows, columns and diagonals give the same sum 1.5.
Solution:
Exercise 1.3
Think (Text book Page No. 13)
Question 1.
How are the products 2.1 × 3.2 and 21 × 32 alike? How are they different.
Solution:
2.1 × 3.2 = 6.72 and 21 × 32 = 672.
In both the cases the digits ambers are the same. But the place value differs.
Try These (Text book Page No. 13)
Question 1.
Shade the grid to multiply 0.3 × 0.6.
3 rows of Yellow represent 0.3, 6 columns of Red colour represent 0.6 Double shaded 18 squares of orange colour represent.
∴ 0.3 × 0.6 = 0.18
Question 2.
Use the area model to multiply
Here each row contains 1 whole and 2 tenths. Each column contains 2 wholes and 5 tenths. The entire area model represents 2 wholes 9 tenths and 10 hundredths ( = 1 tenths). So 1.2 × 2.5 = 3.
Try These (Text book Page No. 14)
Question 1.
Complete the following table
Solution:
Try These (Text book Page No. 15)
Question 1.
Find:
- 9.13 × 10
- 9.13 × 100
- 9.13 × 1000
Solution:
- 9.13 × 10 = 91.3
- 9.13 × 100 = 913
- 9.13 × 1000 = 9130
Try These (Text book Page No. 16)
Question 1.
Complete the following table
Exercise 1.4
Try These (Text book Page No. 19)
Try These (Text book Page No. 19)