NCERT Solutions for Class 4th Maths Chapter 7 Help Udaya Didi find the missing numbers — In-text Questions
Book page 98 Updated on2026-09-19
Q1.
Cost – ₹185, Paid – ₹200, Balance – ______
Answer
Cost –
₹185
Paid –
₹200
Balance –
__________
The card as it is printed on page 98.
The balance is ₹15.
Balance = Paid − Cost = ₹200 − ₹185 = ₹15
The working, written in columns.
Why it happens: There are 0 ones and 0 tens to take away from, so we regroup ₹200 as 1 hundred, 9 tens and 10 ones.
Check it yourself: ₹185 + ₹15 = ₹200. The balance goes back with the cost to make the money paid.
Cost –
₹185
Paid –
₹200
Balance –
₹15
The same card with the missing number filled in.
Q2.
Cost – ______, Paid – ₹200, Balance – 0
Answer
Cost –
__________
Paid –
₹200
Balance –
₹0
The card as it is printed on page 98.
The cost is ₹200.
Balance = 0, so nothing came back. Cost = Paid = ₹200
Why it happens: When the balance is zero, the customer paid the exact price.
Cost –
₹200
Paid –
₹200
Balance –
₹0
The same card with the missing number filled in.
Q3.
Cost – ₹435, Paid – ₹500, Balance – ______
Answer
Cost –
₹435
Paid –
₹500
Balance –
__________
The card as it is printed on page 98.
The balance is ₹65.
₹500 − ₹435 = ₹65
The working, written in columns.
Why it happens: 0 ones cannot give 5 ones, so we regroup 1 hundred as 10 tens and then 1 ten as 10 ones.
Cost –
₹435
Paid –
₹500
Balance –
₹65
The same card with the missing number filled in.
Q4.
Cost – ₹149, Paid – ₹500, Balance – ______
Answer
Cost –
₹149
Paid –
₹500
Balance –
__________
The card as it is printed on page 98.
The balance is ₹351.
₹500 − ₹149 = ₹351
The working, written in columns.
Check it yourself: ₹149 + ₹351 = ₹500.
Cost –
₹149
Paid –
₹500
Balance –
₹351
The same card with the missing number filled in.
Q5.
Cost – ₹46, Paid – ______, Balance – ______
Answer
Cost –
₹46
Paid –
__________
Balance –
__________
The card as it is printed on page 98.
The cost is fixed, but the money paid is our choice. Any note or coins worth ₹46 or more will do.
Sample answer: the customer pays a ₹50 note.
Balance = ₹50 − ₹46 = ₹4
The working, written in columns.
Cost –
₹46
Paid –
₹50
Balance –
₹4
One correct way to fill the card.
Why it happens: The balance is whatever is left after the cost is taken out of the money paid.
Try This: Fill it again with ₹100 paid. The balance then becomes ₹54.
Q6.
Cost – ______, Paid – ₹200, Balance – ₹75
Answer
Cost –
__________
Paid –
₹200
Balance –
₹75
The card as it is printed on page 98.
The cost is ₹125.
Cost = Paid − Balance = ₹200 − ₹75 = ₹125
The working, written in columns.
Why it happens: The money paid is made of two parts — the cost and the balance. Take one part away to get the other.
Cost –
₹125
Paid –
₹200
Balance –
₹75
The same card with the missing number filled in.
Q7.
Cost – ₹580, Paid – ______, Balance – ₹120
Answer
Cost –
₹580
Paid –
__________
Balance –
₹120
The card as it is printed on page 98.
The customer paid ₹700.
Paid = Cost + Balance = ₹580 + ₹120 = ₹700
The working, written in columns.
Why it happens: Here we know both parts, so we put them back together by adding.
Cost –
₹580
Paid –
₹700
Balance –
₹120
The same card with the missing number filled in.
Q8.
Cost – ______, Paid – ______, Balance – ______
Answer
Cost –
__________
Paid –
__________
Balance –
__________
The card as it is printed on page 98.
This card is fully empty, so you make up your own bill. Only one rule must hold:
Cost + Balance = Paid
Sample answer:
Cost –
₹245
Paid –
₹300
Balance –
₹55
One correct way to fill the card.
₹245 + ₹55 = ₹300
Why it happens: The shopkeeper keeps the cost and gives the rest back, so the two parts must add up to the money paid.
Q9.
Lou and Daisy buy 3 kg bananas to eat on the way with their friends. Which of the following options can they use to buy the bananas?
Answer
The five money choices (a) to (e) printed on page 98.
First find what 3 kg of bananas cost. Bananas are ₹55 for 1 kg.
₹55 + ₹55 + ₹55 = ₹165
The working, written in columns.
Now check each option.
Option
Money in it
Enough for ₹165?
(a)
₹200
Yes
(b)
₹100 + ₹50 + ₹10 = ₹160 and one coin
Only if the coin is ₹5 or more
(c)
₹100 + ₹10 = ₹110
No
(d)
20 notes of ₹10 = ₹200
Yes
(e)
₹50 + ₹50 + ₹50 + ₹10 = ₹160
No
So they can pay with (a) or (d).
Why it happens: The money shown must be ₹165 or more, because the shopkeeper cannot be paid less than the cost.
Tip: In the book the coin in (b) is printed with its emblem side showing, so its value cannot be read. If it is a ₹5 coin, option (b) makes exactly ₹165.