Practice Questions with Solutions: Addition and Subtraction

Question 1: Add 4532 and 2687.

Solution: 

Step 1. Arrange the numbers in columns:

Step 2. Add the ones: 2 + 7 = 9.
Step 3. Add the tens: 3 + 8 = 11, write 1 in the tens place and carry 1 to the hundreds place.
Step 4. Add the hundreds: 5 + 6 = 11, plus the carry 1 = 12, write 2 in the hundreds place and carry 1 to the thousands place.
Step 5. Add the thousands: 4 + 2 = 6, plus the carry 1 = 7.

Answer: 7219

Question 2:Add 7895, 5675, and 2589.

Solution: Step 1. Arrange the numbers in columns:

Step 2. Add the ones: 5 + 5 + 9 = 19, write 9 and carry 1 to the tens place.
Step 3. Add the tens: 9 + 7 + 8 = 24, plus the carry 1 = 25, write 5 in the tens place and carry 2 to the hundreds place.
Step 4. Add the hundreds: 8 + 6 + 5 = 19, plus the carry 2 = 21, write 1 in the hundreds place and carry 2 to the thousands place.
Step 5. Add the thousands: 7 + 5 + 2 = 14, plus the carry 2 = 16.

Answer: 16159

Question 3: A farmer had 43,562 apples. He sold 25,789 apples. How many apples does he have left? 

Solution: To find how many apples are left, subtract the apples sold from the total.

Arrange the numbers in columns:

So, the farmer has 17,773 apples left.

Question4: Add 7,521; 1 ,025 and 1 ,352.

Solution :
Step 1. Arrange the numbers in columns.

Step 2. Add the ones: 1 + 5 + 2 = 8.

Step 3. Add the tens: 2 + 2 + 5 = 9.

Step 4. Add the hundreds: 5 + 0 + 3 = 8.

Step 5. Add the thousands: 7 + 1 + 1 = 9.

Hence, 7,521 + 1,025 + 1,352 = 9,898
(Nine thousand, eight hundred ninety-eight).

Question5: Add 2,908, 6,123 and 254

Solution :
Step 1. Arrange the numbers in columns.

Step 2. Add the ones: 8 + 3 + 4 = 15, write 5 and carry 1 to the tens place.

Step 3. Add the tens: 0 + 2 + 5 = 7, plus the carry 1 = 8.

Step 4. Add the hundreds: 9 + 1 + 2 = 12, write 2 and carry 1 to the thousands place.

Step 5. Add the thousands: 2 + 6 + 0 = 8, plus the carry 1 = 9.

Hence,
2,908 + 6,123 + 254 = 9,285 

(Nine thousand, two hundred eighty-five).

Question 6: Which number is 528 more than 7,874?

Solution :

The required number = 7,874 + 528 = 8,402. 
Hence, the required number is 8,402.

Question 7: Simplify : 7,530 + 1, 817 - 5,173

Solution :

Hence, 7,530 + 1,817 - 5,173 = 4,174.

Question 8: 3,856 - 2,385 + 6,389 - 987

Solution :

Hence, 3,856 - 2,385 + 6,389 - 987 = 6,873.

Question 9: Subtract 5,013 from 8,347.

Solution :
Step 1. Arrange the numbers in columns.

Step 2. Subtract the ones: 7 - 3 = 4.

Step 3. Subtract the tens: 4 - 1 = 3.

Step 4. Subtract the hundreds: 3 - 0 = 3.

Step 5. Subtract the thousands: 8 - 5 = 3.

Hence, 8,347 - 5,013 = 3,334
(Three thousand, three hundred thirty-four).

Question10: A factory produced 3,263 mercury lamps in 2012. In 2013, it produced 4,450 mercury lamps. By how much did the factory's production increase?

Solution :

Production in 2013 = 4,450

Production in 2012 = 3,263

Hence, the production increased by 1,187.

Question11: Subtract 2,856 from 8, 153.

Solution :
Step 1. Arrange the numbers in columns.

Step 2. Subtract the ones. Here 3 < 6, so regroup 5 tens and 3 ones as 4 tens and 13 ones. Now 13 - 6 = 7.

Step 3. Subtract the tens. Here 4 < 5, so regroup 1 hundred and 4 tens as 0 hundreds and 14 tens. Now 14 - 5 = 9.

Step 4. Subtract the hundreds. Here 0 < 8, so regroup 8 thousands and 0 hundreds as 7 thousands and 10 hundreds. Now 10 - 8 = 2.

Step 5. Subtract the thousands: 7 - 2 = 5.

Hence, 8,153 - 2,856 = 5,297
(Five thousand, two hundred ninety-seven).

Question12: What must be added to 4,213 to get 7,631?

Solution :

The sum of two numbers = 7,631.
One number= 4,213
The other number= 7,631 - 4,213
= 3,418
Hence, the required number = 3,418.

Question 13: Subtract: 9,000 - 6.124.

Solution:
Step 1. Arrange the numbers in columns.

Step 2. Regroup 9 thousands so that we can subtract the digits in each place:
9 thousands = 8 thousands + 10 hundreds.
10 hundreds = 9 hundreds + 10 tens.
10 tens = 9 tens + 10 ones.

Step 3. Subtract the ones: 10 - 4 = 6.

Step 4. Subtract the tens: 9 - 2 = 7.

Step 5. Subtract the hundreds: 9 - 1 = 8.

Step 6. Subtract the thousands: 8 - 6 = 2.

Hence, 9,000 - 6,124 = 2,876.