Exercise-2.1
Exercise-2.2
Chapter Fractions and Decimals Exercise-2.3
Fractions and Decimals Exercise-2.4
Fractions and Decimals Exercise-2.5
Fractions and Decimals Exercise-2.6
Question 1:
Find:
- 0.2 × 6
- 8 × 4.6
- 2.71 × 5
- 20.1 × 4
- 0.05 × 7
- 211.02 × 4
- 2 × 0.86
Solution:
(i) 0.2 × 6
∵ 2 × 6 = 12 and we have 1 digit right to the decimal point in 0.2.
Thus 0.2 × 6 = 1.2
(ii) 8 × 4.6
∵ 8 × 46 = 368 and there is one digit right to the decimal point in 4.6.
Thus 8 × 4.6 = 36.8
(iii) 2.71 × 5
∵ 271 × 5 = 1355 and there are two digits right to the decimal point in 2.71.
Thus 2.71 × 5 = 13.55
(iv) 20.1 × 4
∵ 201 × 4 = 804 and there is one digit right to the decimal point in 20.1.
∵ 20.1 × 4 = 80.4
(v) 0.05 × 7
∵ 5 × 7 = 35 and there are 2 digits right to the decimal point in 0.05.
Thus 0.05 × 7 = 0.35
(vi) 211.02 × 4
∵ 21102 × 4 = 84408 and there are 2 digits right to the decimal point in 211.02.
Thus 211.02 × 4 = 844.08
(vii) 2 × 0.86
∵ 2 × 86 = 172 and there are 2 digits right to the decimal point in 0.86.
Thus 2 × 0.86 = 1.72
Question 2:
Find the area of rectangle whose length is 5.7 cm and breadth is 3 cm.
Answer:
Length = 5.7 cm
Breadth = 3 cm
Area of rectangle = length × breadth
= 5.7 × 3 = 17.1 cm2
Hence, the required area =17.1 cm2
Question 3:
Find:
- 1.3 × 10
- 36.8 × 10
- 153.7 × 10
- 168.07 × 10
- 31.1 × 100
- 156.1 × 100
- 3.62 × 100
- 43.07 × 100
- 0.5 × 10
- 0.08 × 10
- 0.9 × 100
- 0.03 × 1000
Fractions and Decimals Exercise-2.7
