NCERT Solutions for Class 4th Maths Chapter 4 Ordering, comparing and filling digits — Let Us Do
Book page 60 Updated on2026-09-19
Q1.
4. Arrange the following mountain ranges in decreasing order of height (from highest to lowest). Kangchenjunga 8586, Mullayanagiri 1930, Chaukhamba I 7138, Bailadila Range 1276, Nanda Devi 7816, K2 8611, Kalsubai 1646
Answer
Mountain Range
Height (in meters)
Kangchenjunga
8586
Mullayanagiri
1930
Chaukhamba I
7138
Bailadila Range
1276
Nanda Devi
7816
K2
8611
Kalsubai
1646
Sort by the Thousands digit: 8, 8, 7, 7, 1, 1, 1.
8611 and 8586 → Hundreds 6 > 5 7816 and 7138 → Hundreds 8 > 1 1930, 1646 and 1276 → Hundreds 9 > 6 > 2
Decreasing order
Mountain Range
Height (in meters)
1
K2
8611
2
Kangchenjunga
8586
3
Nanda Devi
7816
4
Chaukhamba I
7138
5
Mullayanagiri
1930
6
Kalsubai
1646
7
Bailadila Range
1276
8611 > 8586 > 7816 > 7138 > 1930 > 1646 > 1276
Why it happens: we never had to look past the Hundreds place, because no two heights share both their Thousands and Hundreds digits.
Q2.
5. Use the signs <, =, > to compare the following. — a) 2 Tens + 4 Thousands + 3 Hundreds □ 2043
Answer
2 Tens + 4 Thousands + 3 Hundreds = 4320 Right side = 2043
4320 > 2043
Answer: >
Why it happens: the left side has 4 thousands while the right side has only 2.
Q3.
5. Use the signs <, =, > to compare the following. — b) 2 Tens + 4 Thousands + 3 Hundreds □ 4320
Answer
2 Tens + 4 Thousands + 3 Hundreds = 4320 Right side = 4320
4320 = 4320
Answer: =
Why it happens: both sides are exactly the same number, so we write =.
Q4.
5. Use the signs <, =, > to compare the following. — c) 2 Thousands + 9 Hundreds + 9 Tens + 9 Ones □ 3000
Answer
2 Thousands + 9 Hundreds + 9 Tens + 9 Ones = 2999 Right side = 3000
2999 is the number just before 3000.
2999 < 3000
Answer: <
Why it happens: the left side is the smaller number.
Q5.
5. Use the signs <, =, > to compare the following. — d) 15 Ones + 9 Tens + 3 Hundreds □ 1593
Answer
15 Ones + 9 Tens + 3 Hundreds = 405 Right side = 1593
Careful: 15 Ones is 15, not 150. So the left side is only a 3-digit number.
405 < 1593
Answer: <
Why it happens: the left side is the smaller number.
Q6.
5. Use the signs <, =, > to compare the following. — e) 5000 + 30 + 4 □ 5034
Answer
5000 + 30 + 4 = 5034 Right side = 5034
5034 = 5034
Answer: =
Why it happens: both sides are exactly the same number, so we write =.
Q7.
5. Use the signs <, =, > to compare the following. — f) 5000 + 300 + 4 □ 5340
Answer
5000 + 300 + 4 = 5304 Right side = 5340
Both are 5 thousands and 3 hundreds. The Tens place decides: 0 < 4.
5304 < 5340
Answer: <
Why it happens: the left side is the smaller number.
Q8.
6. Fill the blanks with digits 0–9 such that the numbers meet the condition. — a) 7__ __3 < 768__
Answer
Sample answer: 7123 < 7680
Check from the left, place by place, that the first number really is smaller.
Number
Th
H
T
O
7123
7
1
2
3
7680
7
6
8
0
Tip: Any digits work as long as the left number stays below 768_. Keeping the Hundreds digit small is the easy way. Other answers are correct too.
Q9.
6. Fill the blanks with digits 0–9 such that the numbers meet the condition. — b) 853__ < 8__3__
Answer
Sample answer: 8530 < 8634
Check from the left, place by place, that the first number really is smaller.
Number
Th
H
T
O
8530
8
5
3
0
8634
8
6
3
4
Tip: The left number is between 8530 and 8539. So the right number needs a Hundreds digit bigger than 5. Other answers are correct too.
Q10.
6. Fill the blanks with digits 0–9 such that the numbers meet the condition. — c) __2__1 < 5__2__
Answer
Sample answer: 1201 < 5023
Check from the left, place by place, that the first number really is smaller.
Number
Th
H
T
O
1201
1
2
0
1
5023
5
0
2
3
Tip: Put a small digit in the first blank on the left. Any thousands digit below 5 makes the left number smaller at once. Other answers are correct too.