CBSE Class 3 Mathematics Revision Worksheet Set 09

Q1. Find the difference:
a)
Th H T O
8 3 0 0
- 5 2 9 3
__________
3 0 0 7

b)
Th H T O
3 9 5 1
- 1 7 8 4
__________
2 1 6 7

Answer:
a) \(8300 - 5293 = 3007\)
b) \(3951 - 1784 = 2167\)
In simple words: Subtract the bottom number from the top number column by column, borrowing when needed.

Exam Tip: Always start subtracting from the ones column and borrow correctly from the left columns if the top digit is smaller than the bottom digit.

Q2. Add the following:
a)
Th H T O
5 1 2 8
7 0 6
+ 4 2 1
__________
6 2 5 5

b)
Th H T O
3 8 5
6 2 4 1
+ 1 9 7 0
__________
8 5 9 6

Answer:
a) \(5128 + 706 + 421 = 6255\)
b) \(385 + 6241 + 1970 = 8596\)
In simple words: Line up the numbers by their place values and add column by column from right to left.

Exam Tip: Align numbers properly according to their columns (Thousands, Hundreds, Tens, Ones) before adding to avoid calculation errors.

Q3. Fill in the blanks:
a) 465 + 398 = 398 + 465
b) 56 x 10 = 560
c) 263 – 10 = 253
d) 572 x 0 = 0
Answer:
a) 465
b) 56
c) 253
d) 0
In simple words: Use basic properties of addition, multiplication, and subtraction to find the missing numbers.

Exam Tip: Remember that changing the order of numbers in addition does not change the sum (commutative property), and any number multiplied by zero is always zero.

Q4. For each of the following addition facts write two subtraction facts:
a) 425 + 318 = 743
743 - 425 = 318 , 743 - 318 = 425
b) 608 + 257 = 865
865 - 608 = 257 , 865 - 257 = 608
Answer:
a) 743 - 425 = 318 , 743 - 318 = 425
b) 865 - 608 = 257 , 865 - 257 = 608
In simple words: Every addition fact can be turned into two subtraction facts by taking the total sum and subtracting one part to get the other part.

Exam Tip: The sum always becomes the starting number (minuend) in the subtraction facts.

Q5. A carton holds 28 oranges. How many oranges are there in 14 such cartons?
Answer:
Number of oranges in 1 carton = 28
Number of cartons = 14
Total number of oranges = \(28 \times 14\)
\(28 \times 10 = 280\)
\(28 \times 4 = 112\)
\(280 + 112 = 392\)
Total oranges = 392
In simple words: Multiply the number of oranges in one carton by the total number of cartons.

Exam Tip: Break down two-digit multiplication using partial products to avoid mistakes.

Q6. A train is carrying 1382 passengers. 356 more passengers get into the train. How many passengers are there in the train now?
Answer:
Initial number of passengers = 1382
Passengers who newly boarded = 356
Total passengers now = \(1382 + 356\)
\(1382 + 356 = 1738\)
Total passengers = 1738
In simple words: Add the new passengers to the passengers already on the train to find the total.

Exam Tip: Look for keywords like "more" or "altogether" to determine whether to add.

Q7.a) Write the sum:
i) 7500 + 300 = 7800
ii) 2000 + 6050 = 8050

b) Regroup and fill in the blanks:
i) 3 tens 5 ones = 2 tens 15 ones
ii) 9 hundreds 2 tens = 8 hundreds 12 tens
Answer:
a) i) 7800, ii) 8050
b) i) 2, ii) 12
In simple words: Regrouping means borrowing 1 unit from a higher place value to make 10 units in the lower place value.

Exam Tip: 1 ten equals 10 ones, and 1 hundred equals 10 tens when regrouping numbers.

Q8. Look at the pattern and write the next three terms:
a) 5, 10, 15, 20, 25, 30, 35
b) 2, 7, 12, 17, 22, 27, 32
c) 21, 24, 27, 30, 33, 36, 39
Answer:
a) 25, 30, 35 (Rule: Add 5)
b) 22, 27, 32 (Rule: Add 5)
c) 33, 36, 39 (Rule: Add 3)
In simple words: Find the difference between consecutive numbers to discover the repeating rule, then apply it to get the next terms.