1. MEASURING LENGTH
Centimetre
We measure short lengths in centimetres.
Example: Length of Pencil.
In short centimetre is written as 'cm'.
Metre
Long lengths are measured in metres.It is the standard unit of length.
Example: Length of a wall.
In short metre is written as 'm'.
1m=100cm
Kilometre
We measure long distances in Kilometres.
Example:Distance between two towns.
In short, kilometres is written as 'km'.
1km=1000 m
Exercise 1(A)
1.Fill in the blanks.
(a) _______________ cm=9 m
(b) 16 km=_____________ m
(c) 3000 m=____________ km
(d) 200 cm=____________ m
(e) 2 km 100 m=_________ m
(f) 6112 m= ____________ km _______________ m
(g) 20 km 100 m= _______ m
(h) 8139 m=____________ km ________________ m
[Answers:(a)900 (b)16000 (c)3 (d)2 (e)2100 (f) 6 km 112 m (g)20100 (h)8 km 139 m]
2.Find the Sum
(a)
(b)
(c) 22km 308 m,219 m and 8 km 80 m
(d) 55 m 80 cm, 40 m 40 cm and 25 m
(e) 35 km 24 m + 72 km 112 m + 10 km 95 m
3.Add the following
(a) 61 km 755 m + 7 km 613 m+ 54 m
(b) 13 km 351 m + 29 km 617 m + 1 km 20 m +87 m
(c) 87 m 10 cm + 15 m 21 cm + 74 cm
(d) 12 m 57 cm + 25 m 40 cm + 31 m
(e) 35 km 24 m + 72 km 112 m + 10 km 95 m
[Answers 2. (a) (b) (c)30 km 607 m (d)96 m 45 cm (e)117 m 231 cm
3. (a)69 km 422 m(b)44 km 75 m(c)103 m 5 cm (d)38 km 28 m (e)117 km 231 m ]
Exercise 1(C)
2.Find the difference between
(a)75 km 215 m and 26 km 378 m
(b)42 m 70 cm and 94 cm
(c)84 km 750 m and 61 km 29 m
(d)178 m 60 cm and 60 cm
3.Subtract the following
(a)74 km 10 m from 97 km 80 m
(b)48 m 52 cm from 71 m 49 cm
(c)100 km from 200 km 500 m
(d)562 km 21 m from 785 km 72 m
(e)38 m 81 cm from 62 m 28 cm
[Answers 2(a)48 km 837 m (b)41 m 76 cm (c)23 km 721 m (d)178 m
3(a)23 km 70 m (b)22 m 97 cm (c) 100 km 500 m
(d)223 km 51 m (e)23 m 47 cm ]
Exercise 1(D)
1. Sundar painted 25 m 80 cm of the fence before lunch break and 8 m 28 cm after lunch. How much fence did he paint altogether?
A. Before lunch break = 25 m 80 cm
After lunch break =8 m 28 cm
Altogether he painted =25 m 80 cm + 8 m 28 cm
=34 m 08 cm
2.A roll of rope contains 86 m 35 cm length. If 37 m 72 cm of the rope is used then what length of the rope is left behind?
A. Total length of the rope = 86 m 35 cm
Length of the rope used = 86 m 35 cm
Length of the rope left behind = 86 m 35 cm - 86 m 35 cm
= 48 m 63 cm
3. Reena walked 2 km 500 m on Monday, 3 km on Tuesday and 5 km 100 m on Wednesday.What was the total distance walked by her in three days?
A. Distance she walked on Monday = 2 km 500 m
Distance she walked on Tuesday = 3 km
Distance she walked on Wednesday= 5 km 100 m
Distance she walked in three days = 2 km 500 m + 3 km + 5 km 100 m
= 10 km 600 m
4. The distance between two towns is 682 km 800 m.A bus has covered 391 km 282 m distance.How much distance is left to be covered?
A. Distance between two towns = 682 km 800 m
Distance that the bus covered = 391 km 282 m
Distance left to be covered = 682 km 800 m - 391 km 282 m
= 291 km 518 m
5. Sahil runs along the sides of a field which measures 35 m 52 cm,28 m 65 cm,34 m 70 cm and 26 m 57 cm respectively.What is the total distance Sahil has to run to complete one round of the field?
A. Length of the sides of the field = 35 m 52 cm , 28 m 65 cm,34 m 70 cm and 26 m 57 cm
The Distance he has to run to complete one round
= 35 m 52 cm + 28 m 65 cm + 34 m 70 cm + 26 m 57 cm
= 99 m 13 cm
6. Mohan jogs 7 km 600 m in the morning and 5 km 212 m in the evening.How much more does he jogs in the morning?
A. In the morning he jogs = 7 km 600m
In the evening he jogs = 5 km 212m
In the morning he jogs 2 km 388 m (7 km 600m - 5 km 212m )more than evening.
7. Mr Karthik travelled 676 km by train, 47 km 502 m by scooter and 890 m by cycle.What was the total distance covered by him?
A. Distance he travelled by train = 676 km
Distance he travelled by scooter = 47 km 502 m
Distance he travelled by cycle = 890 m
Total distance covered by him = 676 km + 47 km 502 m + 890 m
= 724 km 392 m
8. If a wire is 58 m 20 cm long and 36 m of it is used for fencing , how much wire is left over?
A. Length of the wire = 58 m 20 cm
Length of the wire used for fencing = 36 m
Length of the wire left over = 58 m 20 cm - 36 m
=22 m 20 cm
9.A plant was 55 cm when planted,It has grown 1 m 11 cm .How tall is the plant now?
A. Length of the plant = 55 cm
Length plant grown = 1 m 11 cm
Length of the plant now = 1 m 66 cm
10. A tree is 12 m 25 cm tall. The upper part of the tree is broken by the strong wind and the remaining part is 3 m 87 cm tall. What is the length of the broken part of the tree?
A. Length of the tree = 12 m 25 cm
Length of the remaining part after broken= 3 m 87 cm
Length of the broken part = 12 m 25 cm - 3 m 87 cm
= 8 m 38 cm