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\ 26-Sep-2025 Bharat Arora Proof-10 Reader’s Sign _______________________ Date __________

Addition of 3-digit numBers with regrouping

Nobita: There is a charity event in our school

for flood-affected people. I have collected
265 items of clothing including shirts

and trousers from my area.

Shizuka: I have also collected

398 dresses from my area.

Doraemon: You both have

collected 663 items of

clothing.

Nobita: How do you calculate that, Doraemon?

Doraemon: To know the total number of clothing items, we need to add 265 and

398. We can do this step by step as shown here.

Step 1. Add the ones and regroup. H t O

1
5 + 8 = 13 ones 2 6 5

= 1 ten + 3 ones + 3 9 8
3
So, write 3 in the ones column and carry over 1

to the tens column.

Step 2. Add the tens and regroup. Step 3. Add the hundreds.
1 + 6 + 9 = 16 tens 1 + 2 + 3 = 6 hundreds

= 1 hundred + 6 tens So, write 6 in the hundreds
Now, write 6 in the tens column and carry column.

over 1 to the hundreds column. H t O
H t O 1 1

1 1 2 6 5
2 6 5 + 3 9 8
+ 3 9 8 6 6 3

6 3

Thus, 265 + 398 = 663.

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