Question 3: (i) Express 5 cm in metre and kilometer (ii) Express 35 mm in cm, m and km.

Answer: `5 cm = 5xx(1)/(100)m=0.05m`

`5 cm = 5xx(1)/(100000)km`

`=0.00005 km`

Question 4: Express the following in kilogram:

(a) 200 g

Answer: `200 g = (200)/(1000)kg=0.2kg`

(b) 3470 g

Answer: `3470g=(3470)/(1000)kg=3.47kg`

(c) 4 kg 8 g

Answer: `4kg+8g=4kg+(8)/(1000)kg`

`=4kg+0.008kg=4.008kg`

Question 5: Write the following decimal numbers in expanded form:

(a) 20.03

Answer: `2xx10+(3)/(100)`

(b) 2.03

Answer: `2xx1+(3)/(100)`

(c) 200.03

Answer: `2xx100+(3)/(100)`

(d) 2.034

Answer: `2xx1+(3)/(100)+(4)/(1000)`

Question 6: Write the place value of 2 in the following decimal numbers:

2.56

21.37

10.25

9.42

63.352

Answer: (a) One, (b) Ten, (c) One tenth, (d) One hundredth, (e) One thousandth

Question 7: Dinesh went from place A to place B and from there to place C. A is 7.5 km from B and B is 12.7 km from C. Ayub went from place A to place D and from there to place C. D is 9.3 km from A and C is 11.8 km from D. Who travelled more and by how much?

Answer: Distance travelled by Dinesh `= 7.5 km + 12.7 km = 20.2 km` Distance travelled by Ayub `= 9.3 km + 11.8 km = 21.1 km` Now, `21.1 km – 20.2 km = 0.9 km` Ayub travelled more by 0.9 km or 900 m

Question 8: Shyama bought 5 kg 300g apples and 3 kg 250 g mangoes. Sarala bought 4 kg 800 g oranges and 4 kg 150 g bananas. Who bought more fruits?

Answer: Total weight of fruits bought by Shyama `= 5.30 kg + 3.25 kg = 8.55 kg` Total weight of fruits bought by Sarala `= 4.80 kg + 4.15 kg = 8.95 kg` Now, `8.95 kg – 8.55 kg = 0.40 kg` Sarala bought 400 g more fruits than Shyama.