NCERT Solutions for Class 4th Maths Chapter 8 Filling a 1 litre bottle — Let Us Find

Book page 123–124 Updated on2026-09-19

Q1.

How many 500 ml bottles will fill a 1 l bottle?

Answer

Two 500 ml bottles being emptied into one 1 l bottle.

500 ml + 500 ml = 1000 ml
1000 ml = 1 l
So 500 ml = ½ l

2 bottles of 500 ml will fill a 1 l bottle.

Why it happens: 500 is half of 1000. Two halves make one whole, so two 500 ml bottles make exactly 1 litre.

Tip: This is the same idea as 500 g being half of 1 kg.

Q2.

How many 250 ml bottles will fill a 1 l bottle?

Answer

Four 250 ml bottles beside one 1 l bottle.

250 ml + 250 ml + 250 ml + 250 ml = 1000 ml
1000 ml = 1 l
So 250 ml = ¼ l

4 bottles of 250 ml will fill a 1 l bottle.

Why it happens: 250 is a quarter of 1000. Four quarters make one whole, so four 250 ml bottles fill the 1 litre bottle exactly.

Tip: A 250 ml bottle is about one drinking glass. Four glasses of water make 1 litre.

Q3.

How many 100 ml bottles will fill a 1 l bottle?

Answer

A 100 ml bottle being poured into the 1 l bottle on page 123.

Count in hundreds till you reach 1000.

100, 200, 300, 400, 500, 600, 700, 800, 900, 1000
1000 ml = 1 l
So 100 ml is one-tenth of 1 l

10 bottles of 100 ml will fill a 1 l bottle.

Why it happens: Ten hundreds make one thousand. So ten pourings of 100 ml fill the litre bottle.

Tip: This matches the weight picture on page 117 — ten packets of 100 g made 1 kg.

Q4.

How many 250 ml in ½ l = ______ ; 250 ml in 750 ml = ______ ; 100 ml in ½ l = ______ ; 100 ml in 800 ml = ______

Answer

First change ½ l into millilitres.

1 l = 1000 ml
½ l = 500 ml

Now count each one.

Question	Counting	Answer
250 ml in ½ l	250, 500	2
250 ml in 750 ml	250, 500, 750	3
100 ml in ½ l	100, 200, 300, 400, 500	5
100 ml in 800 ml	100, 200, 300, 400, 500, 600, 700, 800	8

2, 3, 5 and 8.

Why it happens: Each answer is just a skip-count. We keep adding the small measure until we reach the big one, and we count how many jumps it took.

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