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NCERT Solutions for Class 5th Maths Chapter 1 Questions 2 to 5 — Let Us Do

Book page 6–7 Updated on2026-09-19

Q1.
2. Fill in the blanks appropriately. Use commas as required. (Table of Numbers and Number Names: 8,045 · 7,209 · 10,599 · Ten thousand seven hundred forty-three · 20,869 · 13,579 · Ten thousand ten · Fifty-six thousand four hundred ninety-one · 45,045 · 39,593 · 50,005 · 26,050 · 81,200 · Ninety thousand nine · Twenty-three thousand two hundred thirty · Thirty-six thousand one)
Answer

Here is the whole table filled in. The orange cells are the ones you had to write.

NumberNumber Name
8,045Eight thousand forty-five
7,209Seven thousand two hundred nine
10,599Ten thousand five hundred ninety-nine
10,743Ten thousand seven hundred forty-three
20,869Twenty thousand eight hundred sixty-nine
13,579Thirteen thousand five hundred seventy-nine
10,010Ten thousand ten
56,491Fifty-six thousand four hundred ninety-one
45,045Forty-five thousand forty-five
39,593Thirty-nine thousand five hundred ninety-three
50,005Fifty thousand five
26,050Twenty-six thousand fifty
81,200Eighty-one thousand two hundred
90,009Ninety thousand nine
23,230Twenty-three thousand two hundred thirty
36,001Thirty-six thousand one

How to turn a number into its name — 3 steps.

  1. Look at the comma. Read the part on its left, then say the word thousand.
  2. Read the part on its right like an ordinary 3-digit number.
  3. If a place has 0, say nothing for it.
45,045 → 45 thousand … 045 → forty-five thousand forty-five

How to turn a name into a number — 3 steps.

  1. Write the thousands part first. Ninety thousand → 90.
  2. Write the rest as a 3-digit block, filling with zeros. Nine → 009.
  3. Join them and put in the comma: 90,009.
Why zeros matter: Ninety thousand nine is 90,009, not 90,900 and not 909. The zeros in the hundreds and tens places show that there are no hundreds and no tens.
Q2.
3. Arrange the numbers below in increasing order. You can use the number line below, if required.
40,34734,40740,47334,74073,40474,43047,34018,926020,00040,00060,00080,000
The eight numbers and the number line printed on page 6.
Answer

Increasing order means smallest first.

18,926 < 34,407 < 34,740 < 40,347 < 40,473 < 47,340 < 73,404 < 74,430

How to sort them — compare from the left.

  1. Look at the ten-thousands digit first. They are 1, 3, 3, 4, 4, 4, 7, 7. So 18,926 (a 1) is the smallest, and the two numbers starting with 7 are the biggest.
  2. Where two numbers tie, move one place right. 34,407 and 34,740 both start 34. Compare the hundreds: 4 against 7. So 34,407 is smaller.
  3. Keep moving right until they differ. 40,347 and 40,473 both start 40. Hundreds: 3 against 4. So 40,347 is smaller.
  4. 73,404 and 74,430: thousands digit 3 against 4. So 73,404 is smaller.

Roughly where they sit on the number line:

020,00040,00060,00080,000 18,92634,407 · 34,74040,347 · 40,47347,34073,404 · 74,430
The eight numbers marked on the number line from 0 to 80,000.
Tip: All eight numbers here have 5 digits, so counting digits does not help. Comparing digit by digit from the left always does.
Q3.
4. A student said 9,990 is greater than 49,014 because 9 is greater than 4. Is the student correct? Why or why not?
Answer

No, the student is not correct. 49,014 is the bigger number.

Step 1 — count the digits.

9,990 has 4 digits
49,014 has 5 digits
A 5-digit number is always bigger than a 4-digit number.

Step 2 — line them up in the place value chart.

TThThHTO
9,99009990
49,01449014

In the TTh column, 9,990 has nothing (0) and 49,014 has 4. So 49,014 wins straight away.

Where the student went wrong: They compared the first digit they saw — the 9 of 9,990 and the 4 of 49,014. But those two 9 and 4 are not in the same column. The 9 of 9,990 is worth 9,000. The 4 of 49,014 is worth 40,000. You may only compare digits that sit in the same place.
Tip: Always compare the number of digits first. Only if the digit counts are equal do you go place by place from the left.
Q4.
4. Use the number line below to find the position of the numbers. Fill in the blanks.
5,00010,00050,000
TThThHTO999049014You can use this place value chart to compare thenumbers.
The number line and the place value chart printed on page 7. Nine boxes are yours to fill.
Answer

Step 1 — find the size of one step.

10,000 – 5,000 = 5,000
So each box goes up by 5,000.

Step 2 — fill the seven empty boxes.

5,000 · 10,000 · 15,000 · 20,000 · 25,000 · 30,000 · 35,000 · 40,000 · 45,000 · 50,000

Check: the last box works out to 50,000, exactly as printed. ✓

Step 3 — place the two numbers.

  • 9,990 sits just before the 10,000 mark — only 10 short of it.
  • 49,014 sits just after the 45,000 mark, close to 50,000.
5,00010,00015,00020,00025,00030,00035,00040,00045,00050,000 9,99049,014
9,990 is just short of 10,000; 49,014 is almost at 50,000. The picture makes it obvious which is bigger.
Q5.
5. Digit swap. (a) In the number 1,478, interchanging the digits 7 and 4 gives 1,748. Now, interchange any two digits in the number 1,478 to make a number that is larger than 5,500.
Answer

Two swaps work. Either one is a correct answer.

Swap the 1 and the 7 : 1,478 → 7,418
Swap the 1 and the 8 : 1,478 → 8,471

How to find them — think about the thousands place.

  1. To be larger than 5,500, the number must start with a digit bigger than 5.
  2. The digits available are 1, 4, 7, 8. The ones bigger than 5 are 7 and 8.
  3. So bring the 7 to the front (swap it with the 1) → 7,418. Or bring the 8 to the front → 8,471.
  4. Check: 7,418 > 5,500 ✓ and 8,471 > 5,500 ✓
Check the other swaps: 4,178 (swap 1 and 4), 1,748 (swap 4 and 7), 1,874 (swap 4 and 8) and 1,487 (swap 7 and 8) are all smaller than 5,500. Only the two above work.
Q6.
5. (b) Interchange two digits of 10,593 to make a number i) Between 11,000 and 15,000. ii) More than 35,000.
Answer

The digits of 10,593, in order, are 1 · 0 · 5 · 9 · 3.

(i) Between 11,000 and 15,000 → 13,590

  1. The number must still start with 1, and its thousands digit must be 1, 2, 3 or 4.
  2. The thousands digit is now 0. Swap it with the 3 at the end.
  3. 10,593 → 13,590
  4. Check: 11,000 < 13,590 < 15,000 ✓

(ii) More than 35,000 → 50,193 (or 90,513)

  1. The ten-thousands digit is only 1. Put a bigger digit there.
  2. Swap the 1 with the 5: 10,593 → 50,193. Check: 50,193 > 35,000 ✓
  3. Or swap the 1 with the 9: 10,593 → 90,513. Check: 90,513 > 35,000 ✓
Careful: Swapping the 1 with the 3 gives 30,591, and 30,591 is less than 35,000. So that swap does not work.
Q7.
5. (c) Interchange two digits of 48,247 to make a number i) As small as possible. ii) As big as possible.
Answer

The digits of 48,247, in order, are 4 · 8 · 2 · 4 · 7.

(i) As small as possible → 28,447

  1. The first digit matters most, so make it as small as you can.
  2. The smallest digit in the number is 2. It sits in the hundreds place.
  3. Swap the leading 4 with that 2. The 4 moves into the hundreds place.
  4. 48,247 → 28,447

(ii) As big as possible → 84,247

  1. Make the first digit as large as you can.
  2. The largest digit in the number is 8. It sits in the thousands place.
  3. Swap the leading 4 with that 8.
  4. 48,247 → 84,247
Why the first digit decides: The first digit of a 5-digit number counts ten-thousands. Changing it by 1 changes the number by 10,000. No swap further to the right can make up for that. So always fix the first digit first.
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