Large Numbers Around Us | FIO

Question 4

For each number given below, write expressions for at least two different ways to obtain the number through button clicks. Think like Chitti and be creative.

(a) 8300

(b) 40629

(c) 56354

(d) 66666

(e) 367813

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Solution

We can break down numbers using place values in different ways.

Step 1 — First way for 8300

We want to make the number 8300. First, we take the digit 8. It is in the thousands place. We multiply 8 by 1000. 8×1000=80008 \times 1000 = 8000 Next, we take the digit 3. It is in the hundreds place. We multiply 3 by 100. 3×100=3003 \times 100 = 300 We add these two results. 8000+3008000 + 300

8300\boxed{\mathbf{8300}}

Step 2 — Second way for 8300

Let us find another way for 8300. We can group the first two digits. This gives us the number 83. The number 83 is followed by two zeros. So, it represents 83 hundreds. We multiply 83 by 100. 83×10083 \times 100

8300\boxed{\mathbf{8300}}

Step 3 — First way for 40629

We want to make the number 40629. First, we take the digit 4. It is in the ten thousands place. We multiply 4 by 10000. 4×10000=400004 \times 10000 = 40000 Next, we take the digit 6. It is in the hundreds place. We multiply 6 by 100. 6×100=6006 \times 100 = 600 Then, we take the digit 2. It is in the tens place. We multiply 2 by 10. 2×10=202 \times 10 = 20 Finally, we take the digit 9. It is in the ones place. We multiply 9 by 1. 9×1=99 \times 1 = 9 We add all these results. 40000+600+20+940000 + 600 + 20 + 9

40629\boxed{\mathbf{40629}}

Step 4 — Second way for 40629

Let us find another way for 40629. We can group the first two digits. This gives us the number 40. The number 40 is in the thousands place. We multiply 40 by 1000. 40×1000=4000040 \times 1000 = 40000 Next, we take the digit 6. It is in the hundreds place. We multiply 6 by 100. 6×100=6006 \times 100 = 600 Then, we group the last two digits. This gives us the number 29. The number 29 is in the ones place. We multiply 29 by 1. 29×1=2929 \times 1 = 29 We add all these results. 40000+600+2940000 + 600 + 29

40629\boxed{\mathbf{40629}}

Step 5 — First way for 56354

We want to make the number 56354. First, we take the digit 5. It is in the ten thousands place. We multiply 5 by 10000. 5×10000=500005 \times 10000 = 50000 Next, we take the digit 6. It is in the thousands place. We multiply 6 by 1000. 6×1000=60006 \times 1000 = 6000 Then, we take the digit 3. It is in the hundreds place. We multiply 3 by 100. 3×100=3003 \times 100 = 300 Finally, we group the last two digits. This gives us the number 54. The number 54 is in the ones place. We multiply 54 by 1. 54×1=5454 \times 1 = 54 We add all these results. 50000+6000+300+5450000 + 6000 + 300 + 54

56354\boxed{\mathbf{56354}}

Step 6 — Second way for 56354

Let us find another way for 56354. We can group the first two digits. This gives us the number 56. The number 56 is in the thousands place. We multiply 56 by 1000. 56×1000=5600056 \times 1000 = 56000 Next, we group the middle two digits. This gives us the number 35. The number 35 is in the tens place. We multiply 35 by 10. 35×10=35035 \times 10 = 350 Finally, we take the digit 4. It is in the ones place. We multiply 4 by 1. 4×1=44 \times 1 = 4 We add all these results. 56000+350+456000 + 350 + 4

56354\boxed{\mathbf{56354}}

Step 7 — First way for 66666

We want to make the number 66666. First, we take the digit 6. It is in the ten thousands place. We multiply 6 by 10000. 6×10000=600006 \times 10000 = 60000 Next, we take the digit 6. It is in the thousands place. We multiply 6 by 1000. 6×1000=60006 \times 1000 = 6000 Then, we take the digit 6. It is in the hundreds place. We multiply 6 by 100. 6×100=6006 \times 100 = 600 Finally, we group the last two digits. This gives us the number 66. The number 66 is in the ones place. We multiply 66 by 1. 66×1=6666 \times 1 = 66 We add all these results. 60000+6000+600+6660000 + 6000 + 600 + 66

66666\boxed{\mathbf{66666}}

Step 8 — Second way for 66666

Let us find another way for 66666. We can group the first two digits. This gives us the number 66. The number 66 is in the thousands place. We multiply 66 by 1000. 66×1000=6600066 \times 1000 = 66000 Next, we group the next two digits. This gives us the number 66. The number 66 is in the tens place. We multiply 66 by 10. 66×10=66066 \times 10 = 660 Finally, we take the digit 6. It is in the ones place. We multiply 6 by 1. 6×1=66 \times 1 = 6 We add all these results. 66000+660+666000 + 660 + 6

66666\boxed{\mathbf{66666}}

Step 9 — First way for 367813

We want to make the number 367813. First, we take the digit 3. It is in the hundred thousands place. We multiply 3 by 100000. 3×100000=3000003 \times 100000 = 300000 Next, we take the digit 6. It is in the ten thousands place. We multiply 6 by 10000. 6×10000=600006 \times 10000 = 60000 Then, we take the digit 7. It is in the thousands place. We multiply 7 by 1000. 7×1000=70007 \times 1000 = 7000 Next, we take the digit 8. It is in the hundreds place. We multiply 8 by 100. 8×100=8008 \times 100 = 800 Finally, we group the last two digits. This gives us the number 13. The number 13 is in the ones place. We multiply 13 by 1. 13×1=1313 \times 1 = 13 We add all these results. 300000+60000+7000+800+13300000 + 60000 + 7000 + 800 + 13

367813\boxed{\mathbf{367813}}

Step 10 — Second way for 367813

Let us find another way for 367813. We can group the first two digits. This gives us the number 36. The number 36 is in the ten thousands place. We multiply 36 by 10000. 36×10000=36000036 \times 10000 = 360000 Next, we group the remaining digits. This gives us the number 7813. The number 7813 is in the ones place. We multiply 7813 by 1. 7813×1=78137813 \times 1 = 7813 We add these two results. 360000+7813360000 + 7813

367813\boxed{\mathbf{367813}}

Answer

(a) 8300: (i) (8×1000)+(3×100)=8300(8 \times 1000) + (3 \times 100) = 8300 (ii) (83×100)=8300(83 \times 100) = 8300

(b) 40629: (i) (4×10000)+(6×100)+(2×10)+(9×1)=40629(4 \times 10000) + (6 \times 100) + (2 \times 10) + (9 \times 1) = 40629 (ii) (40×1000)+(6×100)+(29×1)=40629(40 \times 1000) + (6 \times 100) + (29 \times 1) = 40629

(c) 56354: (i) (5×10000)+(6×1000)+(3×100)+(54×1)=56354(5 \times 10000) + (6 \times 1000) + (3 \times 100) + (54 \times 1) = 56354 (ii) (56×1000)+(35×10)+(4×1)=56354(56 \times 1000) + (35 \times 10) + (4 \times 1) = 56354

(d) 66666: (i) (6×10000)+(6×1000)+(6×100)+(66×1)=66666(6 \times 10000) + (6 \times 1000) + (6 \times 100) + (66 \times 1) = 66666 (ii) (66×1000)+(66×10)+(6×1)=66666(66 \times 1000) + (66 \times 10) + (6 \times 1) = 66666

(e) 367813: (i) (3×100000)+(6×10000)+(7×1000)+(8×100)+(13×1)=367813(3 \times 100000) + (6 \times 10000) + (7 \times 1000) + (8 \times 100) + (13 \times 1) = 367813 (ii) (36×10000)+(7813×1)=367813(36 \times 10000) + (7813 \times 1) = 367813

More questions in FIO

Q1

According to the 2011 Census, the population of the town of Chintamani was about 75,000. How much less than one lakh is 75,000?

Q2

The estimated population of Chintamani in the year 2024 is 1,06,000. How much more than one lakh is 1,06,000?

Q3

By how much did the population of Chintamani increase from 2011 to 2024?

Q4

For each number given below, write expressions for at least two different ways to obtain the number through button clicks. Think like Chitti and be creative.

(a) 8300

(b) 40629

(c) 56354

(d) 66666

(e) 367813

Q5

For the numbers in the previous exercise, find out how to get each number by making the smallest number of button clicks and write the expression.

Q6

Do you see any connection between each number and the corresponding smallest number of button clicks?

Q7

If you notice, the expressions for the least button clicks also give the Indian place value notation of the numbers. Think about why this is so.

Q8

Read the following numbers in Indian place value notation and write their number names in both the Indian and American systems:

(a) 4050678

(b) 48121620

(c) 20022002

(d) 246813579

(e) 345000543

(f) 1020304050

Q9

Write the following numbers in Indian place value notation:

(a) One crore one lakh one thousand ten

(b) One billion one million one thousand one

(c) Ten crore twenty lakh thirty thousand forty

(d) Nine billion eighty million seven hundred thousand six hundred

Q10

Compare and write '<', '>' or '=':

(a) 30 thousand ______ 3 lakhs

(b) 500 lakhs ______ 5 million

(c) 800 thousand ______ 8 million

(d) 640 crore ______ 60 billion

Q11

Find quick ways to calculate these products:

(a) 2×1768×502 \times 1768 \times 50

(b) 72×12572 \times 125 [Hint: 125=10008125 = \frac{1000}{8}]

(c) 125×40×8×25125 \times 40 \times 8 \times 25

Q12

Calculate these products quickly.

(a) 25×12=25 \times 12 = _______

(b) 25×240=25 \times 240 = _______

(c) 250×120=250 \times 120 = _______

(d) 2500×12=2500 \times 12 = _______

(e) _______ ×\times _______ =120000000= 120000000

Q13

Using all digits from 0 – 9 exactly once (the first digit cannot be 0) to create a 10-digit number, write the —

(a) Largest multiple of 5

(b) Smallest even number

Q14

The number 10,30,285 in words is Ten lakhs thirty thousand two hundred eighty five, which has 42 letters. Give a 7-digit number name which has the maximum number of letters.

Q15

Write a 9-digit number where exchanging any two digits results in a bigger number. How many such numbers exist?

Q16

Strike out 10 digits from the number 12345123451234512345 so that the remaining number is as large as possible.

Q17

The words 'zero' and 'one' share letters 'e' and 'o'. The words 'one' and 'two' share a letter 'o', and the words 'two' and 'three' also share a letter 't'. How far do you have to count to find two consecutive numbers which do not share an English letter in common?

Q18

Suppose you write down all the numbers 1, 2, 3, 4, ..., 9, 10, 11, ... The tenth digit you write is '1' and the eleventh digit is '0', as part of the number 10.

(a) What would the 1000th digit be? At which number would it occur?

(b) What number would contain the millionth digit?

(c) When would you have written the digit '5' for the 5000th time?

Q19

A calculator has only '+10,000' and '+100' buttons. Write an expression describing the number of button clicks to be made for the following numbers:

(a) 20,800 (b) 92,100 (c) 1,20,500 (d) 65,30,000 (e) 70,25,700

Q20

How many lakhs make a billion?

Q21

You are given two sets of number cards numbered from 1-9. Place a number card in each box below to get the

(a) largest possible sum

(b) smallest possible difference of the two resulting numbers.

Q22

You are given some number cards; 4000, 13000, 3000, 70000, 150000, 20, 5. Using the cards get as close as you can to the numbers below using any operation you want. Each card can be used only once for making a particular number.

(a) 1,10,000: Closest I could make is 4000 × (20 + 5) + 13000 = 1,13,000

(b) 2,00,000:

(c) 5,80,000:

(d) 12,45,000:

(e) 20,90,800:

Q23

Find out how many coins should be stacked to match the height of the Statue of Unity. Assume each coin is 1 mm thick.

Q24

Grey-headed albatrosses have a roughly 7-feet wide wingspan. They are known to migrate across several oceans. Albatrosses can cover about 900 – 1000 km in a day. One of the longest single trips recorded is about 12,000 km. How many days would such a trip take to cross the Pacific Ocean approximately?

Q25

A bar-tailed godwit holds the record for the longest recorded non-stop flight. It travelled 13,560 km from Alaska to Australia without stopping. Its journey started on 13 October 2022 and continued for about 11 days. Find out the approximate distance it covered every day. Find out the approximate distance it covered every hour.

Q26

Bald eagles are known to fly as high as 4500 – 6000 m above the ground level. Mount Everest is about 8850 m high. Aeroplanes can fly as high as 10,000 – 12,800 m. How many times bigger are these heights compared to Somu’s building?

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