CBSE Class 4 Mathematics Sum Assignment

Question 1(a). Arrange the following numbers and find the sum: \(234 + 678\)
Answer: Arranging vertically by place value:
\(234 + 678 = 912\)
In simple words: Line up the digits in columns of ones, tens, and hundreds, then add them column by column with carrying over where necessary.

Exam Tip: Always align numbers by their rightmost digits (ones place) before performing column addition.

Question 1(b). Arrange the following numbers and find the sum: \(346 + 897\)
Answer: Arranging vertically by place value:
\(346 + 897 = 1243\)
In simple words: Add the ones (\(6 + 7 = 13\)), write \(3\) and carry over \(1\) to the tens place, and continue similarly for other columns.

Exam Tip: Double-check your carry-overs to avoid common addition mistakes in multi-digit problems.

Question 1(c). Arrange the following numbers and find the sum: \(675 + 655\)
Answer: Arranging vertically by place value:
\(675 + 655 = 1330\)
In simple words: Stack the numbers aligning the place values and add each column from right to left.

Question 1(d). Arrange the following numbers and find the sum: \(432 + 799\)
Answer: Arranging vertically by place value:
\(432 + 799 = 1231\)
In simple words: Add the digits column by column starting from the ones place, carrying over as needed.
Exam Tip: Take extra care when adding across columns that result in numbers greater than 9.

Question 2(a). Add: \(6789 + 2309\)
Answer: Arranging vertically by place value:
\(6789 + 2309 = 9098\)
In simple words: Add corresponding digits of the two four-digit numbers from right to left.

Exam Tip: Work methodically from the ones column up to the thousands column.

Question 2(b). Add: \(7892 + 2659\)
Answer: Arranging vertically by place value:
\(7892 + 2659 = 10551\)
In simple words: Sum the digits in each column, making sure to properly record any carried-over values.

Exam Tip: Write neatly so that your columns do not drift and cause addition errors.

Question 2(c). Add: \(8879 + 9065\)
Answer: Arranging vertically by place value:
\(8879 + 9065 = 17944\)
In simple words: Add the ones, tens, hundreds, and thousands columns sequentially from right to left.

Exam Tip: Verify your final sum by estimating or performing the addition a second time.

Question 2(d). Add: \(7543 + 9086\)
Answer: Arranging vertically by place value:
\(7543 + 9086 = 16629\)
In simple words: Combine the values place by place, managing carries carefully.

Exam Tip: Check your addition in the tens and hundreds columns where carrying is frequent.

Question 3(a). Subtract: \(902 - 109\)
Answer: Arranging vertically and borrowing where necessary:
\(902 - 109 = 793\)
In simple words: Borrow from neighboring columns when the top digit is smaller than the bottom digit.

Exam Tip: When borrowing across a zero, remember that the zero becomes 9 after receiving a borrow and passing one on.

Question 3(b). Subtract: \(236 - 199\)
Answer: Arranging vertically and borrowing where necessary:
\(236 - 199 = 37\)
In simple words: Perform column-wise subtraction with appropriate regrouping.

Exam Tip: Double-check subtraction steps involving borrowing from the tens and hundreds places.

Question 3(c). Subtract: \(732 - 328\)
Answer: Arranging vertically and borrowing where necessary:
\(732 - 328 = 404\)
In simple words: Subtract the bottom number from the top number column by column from right to left.

Exam Tip: Always subtract the smaller place values first before moving to larger place values.

Question 3(d). Subtract: \(800 - 294\)
Answer: Arranging vertically and borrowing where necessary:
\(800 - 294 = 506\)
In simple words: Regroup across the zeros in the tens and hundreds places to subtract \(294\) from \(800\).

Exam Tip: Be extra careful with consecutive zeros when borrowing.

Question 4(a). Find the difference: \(9089 - 4555\)
Answer: Arranging vertically and subtracting:
\(9089 - 4555 = 4534\)
In simple words: Subtract each digit of the second number from the corresponding digit of the first number.

Exam Tip: Align all digits correctly by their place values before subtracting.

Question 4(b). Find the difference: \(8112 - 3330\)
Answer: Arranging vertically and subtracting:
\(8112 - 3330 = 4782\)
In simple words: Perform column subtraction from right to left, borrowing when needed.

Question 4(c). Find the difference: \(9765 - 2987\)
Answer: Arranging vertically and subtracting:
\(9765 - 2987 = 6778\)
In simple words: Regroup carefully across columns where the top digit is smaller than the bottom digit.
Exam Tip: Take your time with borrowing steps to ensure complete accuracy.

Question 4(d). Find the difference: \(9876 - 3987\)
Answer: Arranging vertically and subtracting:
\(9876 - 3987 = 5889\)
In simple words: Subtract each digit column by column, utilizing borrowing as required.

Exam Tip: Check your calculations twice when multiple borrowings are involved.

Question 5(a). Write as repeated addition: \(2 \times 8 =\)
Answer: \(8 + 8\)
In simple words: Multiplication represents repeated addition; \(2 \times 8\) means adding \(8\) two times.

Exam Tip: Remember that the first number tells you how many times to add the second number.

Question 5(b). Write as repeated addition: \(6 \times 8 =\)
Answer: \(8 + 8 + 8 + 8 + 8 + 8\)
In simple words: Express the multiplication statement by adding \(8\) six times.

Question 5(c). Write as repeated addition: \(7 \times 4 =\)
Answer: \(4 + 4 + 4 + 4 + 4 + 4 + 4\)
In simple words: Add \(4\) seven times to show the repeated addition form of the product.
Exam Tip: Double-check that you have written the correct number of addends.

Question 5(d). Write as repeated addition: \(5 \times 9 =\)
Answer: \(9 + 9 + 9 + 9 + 9\)
In simple words: Write out the addition of \(9\) five times.

Exam Tip: Multiplication is a shorthand method for adding the same number multiple times.