NCERT Solutions for Class 4th Maths Chapter 8 Dosing cups, droppers and everyday liquids — Let Us Do
Book page 124 Updated on2026-09-19
Q1.
Find a dosing cup or a bottle of 10 ml and try to find how many 10 ml will fill a 100 ml bottle.
Answer
Count in tens up to 100: 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 That is 10 cupfuls
10 dosing cups of 10 ml will fill a 100 ml bottle.
Why it happens: Ten tens make one hundred, so ten 10 ml cupfuls make 100 ml.
Q2.
Find how many 10 ml dosing cups will fill a 250 ml glass?
Answer
10 cups = 100 ml 20 cups = 200 ml 5 cups more = 50 ml 200 ml + 50 ml = 250 ml 20 + 5 = 25 cups
25 dosing cups of 10 ml will fill a 250 ml glass.
Why it happens: 250 has 25 tens in it, and each cupful adds one ten of millilitres.
Q3.
Find how many 10 ml dosing cups will fill a 500 ml vessel?
Answer
25 cups fill 250 ml 500 ml is 250 ml twice 25 + 25 = 50 cups
50 dosing cups of 10 ml will fill a 500 ml vessel.
Why it happens: Doubling the water means doubling the number of cupfuls.
Q4.
Find how many 10 ml dosing cups will fill a 1 l bottle?
Answer
1 l = 1000 ml 50 cups fill 500 ml 1000 ml is 500 ml twice 50 + 50 = 100 cups
100 dosing cups of 10 ml will fill a 1 l bottle.
Why it happens: 1000 has 100 tens in it, so 100 cupfuls of 10 ml make 1 litre.
Tip: Doing this for real takes a long time. Try 10 cupfuls, mark the level, and then work out the rest.
Q5.
Take a 1 ml dropper and find out how many 1 ml droppers will fill a 10 ml dosing cup?
Answer
1, 2, 3, 4, 5, 6, 7, 8, 9, 10 That is 10 droppers
10 droppers of 1 ml will fill a 10 ml dosing cup.
Why it happens: Ten ones make one ten, so ten 1 ml droppers make 10 ml.
Q6.
How many droppers will fill a teaspoon?
Answer
A teaspoon holds about 5 ml 1 + 1 + 1 + 1 + 1 = 5 ml That is 5 droppers
About 5 droppers of 1 ml will fill one teaspoon.
Why it happens: A teaspoon is a small measure of about 5 ml, so five 1 ml droppers just fill it.
Tip: Check it with your own spoon. Spoons are not all the same size, so your answer may be 4 or 6.
Q7.
Find out how much of these liquids are used at a time. a) Eye drops — Less than 1 ml at a time. b) Honey c) Cough Syrup d) Cooking Oil e) ____________
Answer
The pictures beside this question show: an eye-drop bottle, a jar of honey with a spoon, a cough syrup bottle with a spoon, and a bottle of cooking oil.
The book has already filled in (a) for you. Here are the rest:
Liquid
How much is used at a time
a) Eye drops
Less than 1 ml at a time (about 1 drop)
b) Honey
About 5 ml — one teaspoon
c) Cough Syrup
About 5 ml to 10 ml — one or two teaspoons
d) Cooking Oil
About 15 ml to 30 ml — one or two tablespoons
e) Milk (your own choice)
About 200 ml — one glass
Why it happens: Strong things like medicine are used in very small amounts, so we measure them in millilitres. Things we drink or cook with are used in bigger amounts.
Tip: In part (e) you may write any liquid you like, such as milk, tea, buttermilk or shampoo. Just write how much of it is used at one time.