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
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. Next, we take the digit 3. It is in the hundreds place. We multiply 3 by 100. We add these two results.
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.
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. Next, we take the digit 6. It is in the hundreds place. We multiply 6 by 100. Then, we take the digit 2. It is in the tens place. We multiply 2 by 10. Finally, we take the digit 9. It is in the ones place. We multiply 9 by 1. We add all these results.
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. Next, we take the digit 6. It is in the hundreds place. We multiply 6 by 100. 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. We add all these results.
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. Next, we take the digit 6. It is in the thousands place. We multiply 6 by 1000. Then, we take the digit 3. It is in the hundreds place. We multiply 3 by 100. 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. We add all these results.
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. 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. Finally, we take the digit 4. It is in the ones place. We multiply 4 by 1. We add all these results.
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. Next, we take the digit 6. It is in the thousands place. We multiply 6 by 1000. Then, we take the digit 6. It is in the hundreds place. We multiply 6 by 100. 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. We add all these results.
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. 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. Finally, we take the digit 6. It is in the ones place. We multiply 6 by 1. We add all these results.
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. Next, we take the digit 6. It is in the ten thousands place. We multiply 6 by 10000. Then, we take the digit 7. It is in the thousands place. We multiply 7 by 1000. Next, we take the digit 8. It is in the hundreds place. We multiply 8 by 100. 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. We add all these results.
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. 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. We add these two results.
Answer
(a) 8300: (i) (ii)
(b) 40629: (i) (ii)
(c) 56354: (i) (ii)
(d) 66666: (i) (ii)
(e) 367813: (i) (ii)
More questions in FIO
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?
The estimated population of Chintamani in the year 2024 is 1,06,000. How much more than one lakh is 1,06,000?
By how much did the population of Chintamani increase from 2011 to 2024?
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
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.
Do you see any connection between each number and the corresponding smallest number of button clicks?
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.
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
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
Compare and write '<', '>' or '=':
(a) 30 thousand ______ 3 lakhs
(b) 500 lakhs ______ 5 million
(c) 800 thousand ______ 8 million
(d) 640 crore ______ 60 billion
Find quick ways to calculate these products:
(a)
(b) [Hint: ]
(c)
Calculate these products quickly.
(a) _______
(b) _______
(c) _______
(d) _______
(e) _______ _______
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
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.
Write a 9-digit number where exchanging any two digits results in a bigger number. How many such numbers exist?
Strike out 10 digits from the number 12345123451234512345 so that the remaining number is as large as possible.
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?
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?
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
How many lakhs make a billion?
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.
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:
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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?