In 1st grade, we have learnt the subtraction of 1digit and 2digit numbers. Here, we will learn simple subtraction of 3digit numbers without regrouping (borrowing).
We subtract 3digit numbers in the same way as we subtract 2digit numbers.
Let us subtract 345 from 689.
To perform the above subtraction, we take the following steps:
Step I: Write the given numbers in column form as shown. Step II: Subtract the ones: 9  5 = 4 Write 4 under ones column. Step III: Subtract the ten 8  4 = 4 Write 4 under tens column. Step IV: Subtract the hundreds: 6  3 = 3 Write 3 under hundreds column. 

Thus, the difference between 689 and 345 is 344.
Questions and Answers on Addition of 3Digit Numbers Without Carrying:
1. Workout the following subtraction:
(i) 
H T O 8 9 5  6 4 3 ___________ 
(ii) 
H T O 6 4 1  3 2 0 ___________ 
(iii) 
H T O 9 8 7  6 5 3 ___________ 
(iv) 
H T O 8 7 3  4 0 1 ___________ 
(v) 
H T O 7 5 8  3 2 4 ___________ 
(vi) 
H T O 9 8 6  5 6 4 ___________ 
(vii) 
H T O 3 9 4  2 4 0 ___________ 
(viii) 
H T O 6 8 8  3 7 8 ___________ 
Answer:
1. (i) 252
(ii) 321
(iii) 334
(iv) 472
(v) 434
(vi) 422
(vii) 154
(viii) 310
2. Arrange in columns and add:
(i) 748  536
(ii) 891  640
(iii) 425  214
(iv) 675  451
(v) 549  304
(vi) 987  743
Answer:
2. (i) 212
(ii) 251
(iii) 211
(iv) 224
(v) 245
(vi) 244
3. Word Problems on 3Digit Subtraction without Regrouping:
(i) A tree had 585 mangoes on it. The gardener plucked 372 mangoes from it. How many mangoes were left on the tree?
(ii) There are 598 students in a school. 236 students were present on Monday. How many were absent?
(iii) A train carried 984 passengers at a station, 472 of them got off. How many passengers were left in the train?
(iv) Rebecca earned 688 rupees during last week. She spent 154 rupees during the week. How many rupees did she save?
(v) A fruitseller bought 789 apples from a wholesaler. 163 apples were found rotten. How many apples were good?
(vi) Sharon's comic book has 355 pages. She has read 321 pages. How many pages she still has to read?
Answer:
3. (i) 213
(ii) 362
(iii) 512
(iv) 534
(v) 626
(vi) 34
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