Chapter 7

Daisy and Lou study in Grade 4 in Shillong, Meghalaya. The school has circulated the following poster for a field trip.

Daisy and Lou Go Shopping

Daisy and Lou are very excited about their trip. They join their mother in the weekly shopping as they need to buy things for their trip. The family makes a list of things to buy:
• Fruits and vegetables
• Field Trip Items-Biscuits, Water Bottles, and Dry Fruits.
Sapan Dada has a cart for selling vegetables and fruits. The prices of the vegetables and fruits are given below. Sapan Dada asks Daisy and Lou to find the costs of different quantities of fruits and vegetables. Help them to complete the tasks. You may use a number line, play money or any other method to calculate.

2 kg of beans _________	1 kg of custard apple and 1 kg of sapota _________	1 kg of onion and 1 kg of potato _________
1 kg of radish and 1 kg of yam _________	2 kg of radish and 2 kg of papaya _________	2 kg of onion and 2 kg of potato _________

What do you notice about these two costs? Their mother buys things for ₹ 163. What might she have bought? There is more than one possibility.                   ₹ 163 Udaya Didi runs a store selling rice, atta, daal, and spices. Daisy and Lou help Udaya Didi return the balance to customers while their mother buys the groceries. Udaya Didi also asks them some tricky questions.

Help them find the missing numbers in each of the following. Use a number line, play money or any other way to find the balances.

Cost -	₹ 113	Cost -	₹ 185	Cost -	_____
Paid -	₹ 150	Paid -	₹ 200	Paid -	₹ 200
Balance -	₹ 37	Balance -	_____	Balance -	0

Cost -	₹ 435	Cost -	₹ 149	Cost -	₹ 46
Paid -	₹ 500	Paid -	₹ 500	Paid -	_____
Balance -	_____	Balance -	____	Balance -	____

Cost -	____	Cost -	₹ 580	Cost -	____
Paid -	₹ 200	Paid -	____	Paid -	____
Balance -	₹ 75	Balance -	₹ 120	Balance -	_____

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?

A Strange Puzzle!

Four naughty kids on a walk come across a fresh orange crop.
They ask the farmer the price of one.
The farmer says, “Each costs ₹ 21”.

Two oranges each they buy.
The farmer gives them with a sigh.
They all reach in to their jackets,
To take out notes from their pockets. Each one pays a different note,
Krishna a ₹ 50 and Sudama a ₹ 100
Mala a ₹ 200 and Neela a ₹ 500.

What is the balance that they each got?

Let Us Play

Place the numbers 1–6 in the blanks in such a way that the sum on each side of the triangle is 9. No numbers should be repeated. Use the same numbers 1–6 and make the sum 10 on each side of the triangle. What other sums can you make with these 6 numbers?

Can you make 12 on each side? Can you make 13?

Add Up

Daisy and Lou leave for the field trip by a bus the next morning. 24 teachers and 438 children are going from their school. 476 children from a neighbourhood school along with 28 teachers are also going to the same village. How many teachers are accompanying the children? 24 + 28 = 52 There are 52 teachers accompanying the children. How many children are going on the trip? 438 + 476 914 children are going to Mawlynnong. Daisy and Lou ate one large piece of pusaw for ₹ 38. They liked it a lot and bought another small piece for ₹ 16. How much did they spend on pusaw? 38 + 16 Write the final answer after regrouping in the boxes above. They spent ₹______ Daisy and Lou had collected ₹ 185 in their piggy bank. Their mother gave them ₹ 125 more for the trip. How much money did they take for the trip? 185 + 125 Write the final answer after regrouping in the boxes above. Daisy and Lou took ₹______ for the trip.

Let Us Do

1. In Kalakshitij, a school of performing arts, the following number of students are learning to sing and play the tabla. Estimate and then find the total number of students.

	Tabla players	Singers	Total
Boys	78	532	_____boys
Girls	95	346	_____girls
Total	_____tabla players	_______singers

15 more girls join the music school and they want to learn to play the tabla. How many girls play the tabla now? 2. Add by aligning the numbers in columns in your notebook.

a) 32 + 47	(b) 654 + 95	(c) 286 + 123
d) 476 + 324	(e) 700 + 289	(f) 534 + 483

3. Preeti’s school has 423 children. Her school has 178 children less than her cousin’s school. How many children study in Preeti’s cousin’s school?

Subtract It

The buses stopped for a snack on the way. 83 children bought Pusaw. 46 children bought fruit plates. How many more children bought Pusaw?

The diference between the children who bought pusaw and those who bought fruit plates is 83–46. 3 T + 7 O = 37 37 more children bought Pusaw than fruit plate.

All 438 decide to visit the famous Living Roots Bridge in Mawlynnong village. First, 215 children go to see the Living Roots Bridge. How many children are waiting to visit the Living Roots Bridge?

The number of children who are waiting = 438–215. 2 H + 2 T+ 3 O = 223 223 children are waiting. Lou and Daisy brought ₹ 310 in all. After spending on food and some gifts, they are left with ₹ 179. How much money have they spent till now?

Rupees spent = 310–179. 1 H + 3 T + 1 O = 131

So, they have spent ₹131.

Let Us Solve

Ram Chacha got 264 mangoes from his mango tree last year. This year he got 527 mangoes. How many more mangoes did he get this year? Use/draw tokens for the above problem, if needed. 4. During the festival of dolls (Gombe Habba in Dussehra), Ranganna made 639 dolls. He was able to sell 531 dolls. How many dolls are left with him? No. of dolls left = ________ Use/draw tokens for the above problem, if needed. 5. Subtract by aligning the numbers in columns in your notebook.

a) 83 – 29	(b) 345 – 123	(c) 763 – 437
d) 803 – 350	(e) 900 – 328

Let Us Solve

1. These books are in the community library of Wakanda village. Children borrow these books to read during their vacation.

Name of the book		Pages in the book
	Swami and Friends	179
	Panchantantra Tales	236
	Karadi Tales	30
	Akbar Birbal	96
	Blue Umbrella	90
	Adventures of Feluda	128

a) Rami read Panchatantra Tales during the summer vacation. Kesu read Akbar Birbal, Karadi Tales and Blue Umbrella. Who do you think read more? How many more pages?

b) Sumi has read 23 pages of Adventures of Feluda. How many more pages are left to complete the book?

c) Jaggu decides to read all the books listed here during his vacation. He has finished reading Swami and Friends, Akbar Birbal and 50 pages of Feluda in 4 weeks. How many more pages does he have to read to finish reading all the books?

2. A daily train between Delhi and Aligarh travels a distance of 131 km. Look at the picture below and answer the questions that follow.

a) How many passengers are there on the train when it leaves Dadri?_________________

b) Find the number of people who got off the train at Aligarh._________________

c) Were there more people on the train in New Delhi or in Aligarh? How much more/less? _________________

d) How many people travelled altogether by the train?_________________

Let Us Solve

c. Find quick ways of solving. Think about some of the strategies you learnt in Grade 3.

326 + 25 = _______	410 – 12 = _______	675 + 5 = _______
204 – 10 = _______	811 + 99 = _______	945 – 19 = _______

d. Solve by aligning the numbers in columns in your notebook.

1. 38 + 943	2. 465 + 305
3. 435 + 462	4. 764 – 657
5. 518 – 209	6. 879 – 53

e. Find two numbers such that their sum is 856. Find another two numbers such that their difference is 563. Make your own word problems with these numbers.

856 = ________ + ________

_______________________

563 =________ - ________

_______________________

Number Pair Hunt

Here is a grid of numbers. There are many number pairs in this grid. A number pair has 2 numbers which are next to each other, vertically or horizontally. For example, the numbers 111 and 185 are number pairs 48 and 185 are number pairs in this grid.

35	100	179	68
111	185	143	54
300	48	225	190
54	321	63	167

1. Find the number pair whose sum is the greatest._____________

2. Find the number pair whose sum is the smallest._____________

3. Find the number pair whose difference is the greatest._____________

4. Find the number pair whose difference is the smallest._____________

The Missing Digits

Fill the missing digits below to make each of the following sums correct.

	__	6
+	1	__
	5	0

	1	__
+	2	__
	3	8

	3	__	2
+	__	8	8
	8	9	0

	7	__
-	4	__
	2	7

	6	5
-	__	__
	2	5

	4	7	__
-	1	4	__
	__	2	7