CBSE Class 3 Mathematics Practice Test Worksheet Set 07

1. Fill in the blanks:

a. 6240 - ______ = 6240
Answer: 0
In simple words: Subtracting zero from any number leaves the number unchanged.

Exam Tip: Remember the property that subtracting 0 from a number gives the same number.

b. 77 - 20 = ___________
Answer: 57
\(77 - 20 = 57\)
In simple words: Subtract 2 tens from 77 to get 57.

Exam Tip: Always subtract digits place by place starting from the ones column.

c. 8246 - 1 = ___________
Answer: 8245
\(8246 - 1 = 8245\)
In simple words: Subtracting 1 gives the predecessor of the number.

Exam Tip: Subtracting 1 always decreases the ones digit by 1.

d. 47 - 13 = ___________
Answer: 34
\(47 - 13 = 34\)
In simple words: Subtracting 3 from 7 gives 4, and subtracting 1 from 4 gives 3.

Exam Tip: Line up the numbers vertically by place value for easier mental subtraction.

e. 1862 - ______ = 1861
Answer: 1
In simple words: The number decreases by 1, so the missing number is 1.

Exam Tip: Find the difference between the two given numbers to find the missing subtrahend.

f. 50 - ______ = 40
Answer: 10
In simple words: 50 minus 10 equals 40.

Exam Tip: Subtract the result from the starting number to find the missing value: \(50 - 40 = 10\).

g. 786 - 786 = ___________
Answer: 0
In simple words: Subtracting a number from itself always results in zero.

h. Subtract 20 from 80 = ___________
Answer: 60
\(80 - 20 = 60\)
In simple words: Take away 20 from 80 to get 60.

Exam Tip: "Subtract A from B" means write it as \(B - A\).

i. 25 minus 10 is ___________
Answer: 15
\(25 - 10 = 15\)
In simple words: 25 decreased by 10 is 15.

Exam Tip: The word "minus" indicates subtraction.

j. 16 minus 0 is ___________
Answer: 16
\(16 - 0 = 16\)
In simple words: Subtracting zero leaves the number unchanged.

Exam Tip: Zero has no value to remove, so the number remains the same.

k. Difference between 724 and 723 is ___________
Answer: 1
\(724 - 723 = 1\)
In simple words: The distance between consecutive numbers is 1.

Exam Tip: Difference always means the larger number minus the smaller number.

l. 40 taken away from 50 is ___________
Answer: 10
\(50 - 40 = 10\)
In simple words: Removing 40 from 50 leaves 10.

Exam Tip: "Taken away from" means subtract the first number from the second number.

m. 286 is less than 297 by ___________
Answer: 11
\(297 - 286 = 11\)
In simple words: Subtract 286 from 297 to find the difference of 11.

Exam Tip: To find how much less one number is than another, subtract the smaller from the larger.

2. Subtract:

Problem (1):

Answer: 654
Step 1: Regroup from hundreds to tens and ones. 9 hundreds become 8 hundreds, 10 tens, and then 9 tens and 10 ones.
Step 2: Ones: \(10 - 6 = 4\)
Step 3: Tens: \(9 - 4 = 5\)
Step 4: Hundreds: \(8 - 2 = 6\)
In simple words: Borrow step-by-step from left columns when the top digit is smaller.
Exam Tip: Always borrow carefully across zeros.

Problem (2):

Answer: 4490
Step 1: Ones: \(4 - 4 = 0\)
Step 2: Tens: Borrow from hundreds, \(18 - 9 = 9\)
Step 3: Hundreds: Borrow from thousands, \(11 - 7 = 4\)
Step 4: Thousands: \(5 - 1 = 4\)
In simple words: Subtract column by column from right to left with borrowing.
Exam Tip: Double-check subtraction results by adding the answer to the bottom number.

Problem (3):

Answer: 2780
Step 1: Ones: \(8 - 8 = 0\)
Step 2: Tens: Borrow from hundreds, \(11 - 3 = 8\)
Step 3: Hundreds: Borrow from thousands, \(15 - 8 = 7\)
Step 4: Thousands: \(4 - 2 = 2\)
In simple words: Subtract each column carefully after borrowing when needed.
Exam Tip: Neatly cross out digits when you borrow to avoid calculation mistakes.

Problem (4):

Answer: 5607
Step 1: Ones: \(7 - 0 = 7\)
Step 2: Tens: \(7 - 7 = 0\)
Step 3: Hundreds: \(7 - 1 = 6\)
Step 4: Thousands: \(7 - 2 = 5\)
In simple words: Subtract digit by digit from right to left without needing any borrows.
Exam Tip: Verify if borrowing is actually required before altering any digits.

3. Arrange in columns and subtract:

a. 568 from 786
Answer: 218
Arranging in columns:
  786
- 568
----
  218
Step 1: Ones: Borrow from tens, \(16 - 8 = 8\)
Step 2: Tens: \(7 - 6 = 1\)
Step 3: Hundreds: \(7 - 5 = 2\)
In simple words: Place the larger number on top and subtract the smaller number.

Exam Tip: Always place the number after "from" on the top row.

b. 1240 from 8620
Answer: 7380
Arranging in columns:
  8620
- 1240
----
  7380
Step 1: Ones: \(0 - 0 = 0\)
Step 2: Tens: Borrow from hundreds, \(12 - 4 = 8\)
Step 3: Hundreds: \(5 - 2 = 3\)
Step 4: Thousands: \(8 - 1 = 7\)
In simple words: Subtract column-wise after borrowing where necessary.

Exam Tip: Align all digits strictly according to their place values.

4. Divide by repeated subtraction:
36 \(\div\) 9
Answer: 4
\(36 - 9 = 27\) (1st subtraction)
\(27 - 9 = 18\) (2nd subtraction)
\(18 - 9 = 9\) (3rd subtraction)
\(9 - 9 = 0\) (4th subtraction)
Total number of times 9 was subtracted = 4
In simple words: Subtract the divisor repeatedly until you reach 0. The count of subtractions is the answer.

Exam Tip: Repeated subtraction is the fundamental concept behind division.

5. Divide and find the quotient:

a. \(4 \overline{)\,8084\,}\)
Answer: Quotient = 2021
Step 1: \(4 \times 2 = 8\) (Thousands place)
Step 2: \(4 \times 0 = 0\) (Hundreds place)
Step 3: \(4 \times 2 = 8\) (Tens place)
Step 4: \(4 \times 1 = 4\) (Ones place)
Result = 2021
In simple words: Divide each digit of the dividend by 4 from left to right.

Exam Tip: Put a 0 in the quotient if a digit is smaller than the divisor.

b. \(6 \overline{)\,942\,}\)
Answer: Quotient = 157
Step 1: Hundreds: \(6 \times 1 = 6\), remainder 3. Bring down 4 to make 34.
Step 2: Tens: \(6 \times 5 = 30\), remainder 4. Bring down 2 to make 42.
Step 3: Ones: \(6 \times 7 = 42\), remainder 0.
Result = 157
In simple words: Divide digit by digit, carrying over any remainder to the next place value.

6. I have to distribute 32 sweets amongst my 4 friends equally. How many sweets will each friend get?
Answer: 8 sweets
Total number of sweets = 32
Number of friends = 4
Sweets each friend gets = \(32 \div 4 = 8\)
In simple words: Divide the total number of sweets equally among the friends.

Exam Tip: Equal distribution always implies division.

7. 10 pencils can be packed in a box. How many boxes will be required to pack 420 pencils?
Answer: 42 boxes
Total number of pencils = 420
Pencils in each box = 10
Number of boxes required = \(420 \div 10 = 42\)
In simple words: Divide the total number of pencils by the number of pencils per box.

Exam Tip: When dividing by multiples of 10, cancel out the matching zeros to simplify calculation.