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NCERT Solutions for Class 5th Maths Chapter 4 The Longest Land Route — The Longest Land Route — Adding Large Numbers

Book page 46–47 Updated on2026-09-19

Q1.
One of the places on the North–South Corridor was 1,855 km from Srinagar and 1,862 km from Kanniyakumari. What was the total length of the North–South Corridor in 2019?
Answer

The North–South Corridor was 3,717 km long.

The place marked A on the map splits the whole road into two parts. One part reaches back to Srinagar, the other goes on to Kanniyakumari. Put the two parts together to get the whole road.

Total length = 1,855 km + 1,862 km
  1. Ones: 5 + 2 = 7. Write 7.
  2. Tens: 5 + 6 = 11. Write 1 and carry 1 hundred.
  3. Hundreds: 8 + 8 = 16, and the carried 1 makes 17. Write 7 and carry 1 thousand.
  4. Thousands: 1 + 1 = 2, and the carried 1 makes 3. Write 3.
ThHTO
1 (carried)1 (carried)
1855
+ 1862
3717
Total length of the North–South Corridor = 3,717 km
One thing to notice in the book: The map beside the paragraph prints 1885 km for the northern part, but the words in the paragraph say 1,855 km, and the worked sum on page 47 also uses 1,855 km. Use 1,855 km — the map label is a printing slip.
Q2.
Do you remember how to add large numbers?
Answer

Yes — a big number is added in exactly the same way as a small one. Only the number of columns changes.

  1. Write the numbers one under the other so that ones sit under ones, tens under tens, hundreds under hundreds and thousands under thousands.
  2. Add the ones column first.
  3. If any column reaches 10 or more, keep the ones digit there and carry 1 to the column on its left.
  4. Work leftwards, column by column, until you have done the last one.
Why the method does not change: Ten ones always make one ten, ten tens always make one hundred, and ten hundreds always make one thousand. The rule for swapping ten small units for one bigger unit is the same at every place, so the same method carries on for as long as the number is.
1,855 + 1,862
Ones: 5 + 2 = 7
Tens: 5 + 6 = 11 → write 1, carry 1
Hundreds: 8 + 8 + 1 = 17 → write 7, carry 1
Thousands: 1 + 1 + 1 = 3
3,717
Q3.
Mahesh and his family decide to drive from Srinagar to Kanniyakumari. He spends ₹21,880 on fuel and toll tax, and ₹38,900 on other expenses during this journey. How much did he spend in total?
Answer

Mahesh spent ₹60,780 in all.

There are two amounts of money, and we want them put together. So we add.

Total spent = ₹21,880 + ₹38,900
  1. Ones: 0 + 0 = 0.
  2. Tens: 8 + 0 = 8.
  3. Hundreds: 8 + 9 = 17. Write 7 and carry 1 thousand.
  4. Thousands: 1 + 8 = 9, and the carried 1 makes 10. Write 0 and carry 1 ten-thousand.
  5. Ten-thousands: 2 + 3 = 5, and the carried 1 makes 6. Write 6.
TThThHTO
1 (carried)1 (carried)
21880
+ 38900
60780
Total money spent = ₹60,780
Check it yourself: 60,780 − 38,900 = 21,880, which is the fuel and toll amount we started with ✓
Q4.
Mentally track the positions of the digits as you add. (Example: 267 + 54)
Answer

Once the digits are lined up properly you no longer need to write TTh, Th, H, T and O at the top. Your eye can see the columns.

  2 6 7
+   5 4
———
  3 2 1
  1. Line up the numbers from the right. The 7 and the 4 must be in the same column, and the 6 and the 5 in the same column. The 2 stands alone.
  2. Ones: 7 + 4 = 11. Write 1 and carry 1 ten.
  3. Tens: 6 + 5 = 11, and the carried 1 makes 12. Write 2 and carry 1 hundred.
  4. Hundreds: 2 and the carried 1 make 3. Write 3.
267 + 54 = 321
Why lining up from the right matters: A digit means nothing on its own — 5 can stand for five, or fifty, or five hundred. The column tells you which. If the 54 slipped one column to the left, you would be adding 540 by mistake.
Tip: Numbers of different lengths are the easy place to slip. Always start writing from the ones end, never from the left.
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