Question 1

Question 1: Carry out the following divisions. i. 4.8÷2 ii. 17.5÷5 iii. 20.6÷2 iv. 32.5÷25

Accepted Answer

i. 4.8÷2

Question 2

Question 2: A road is 4 km 800 m long. If trees are planted on both its sides at intervals of 9.6 m, how many trees were planted?

Accepted Answer

Length of road = 4 km 800 m = 4 × 1000 m + 800 m = 4000 m + 800 m = 4800 m Number of trees on one side = 4800 ÷ 9.6 = 500 ∴ Number of trees on both sides = 2 x number of trees on one side = 2 x 500 = 1000 If the trees are planted at the beginning of the road, then Total number of trees = 1000 + 2 =

Question 3

Question 3: Pradnya exercises regularly by walking along a circular path on a field. If she walks a distance of 3.825 km in 9 rounds of the path, how much does she walk in one round?

Accepted Answer

Total distance walked in 9 rounds = 3.825 km ∴Distance walked in 1 round = 3.825 4 ÷ 9 = 0.425 km ∴ Total distance walked in 1 round is 0.425 km.

Question 4

Question 4: A pharmaceutical manufacturer bought 0.25 quintal of hirada, a medicinal plant, for Rs 9500. What is the cost per quintal of hirada? (1 quintal = 100 kg)

Accepted Answer

Cost of 0.25 quintal of hirada = Rs 9500 ∴ Cost of 1 quintal of hirada = 9500 ÷ 0.25 = Rs 38,000 ∴ Cost per quintal of hirada is Rs 38,000.

Question 5

Question 1: Maths is fun! (Textbook pg. no. 34) Take two or three other numbers. Do the same multiplication and find out how it is done.

Accepted Answer

7 × 13 × 11 = 1001
∴ 527 × 1001 = 527 × (1000+ 1)
= (527 × 1000) + (527 × 1)
= 527000 + 527 = 527527
Thus, when any three-digit number is multiplied with 1001, the product obtained is a six-digit number in which the original three-digit number is written back to back twice.
(Students may consider any other three-digit numbers and verify the property.)

Chapter 5 Decimal Fractions Practice Set 17 Solutions