CBSE Class 4 Maths Multiply Set 03

Assignment - 15

Multiply the following.

Question 1 a. \(5 \times 500 =\)
Answer: 2500
Calculation:
\(5 \times 5 = 25\)
Attach the two zeros from 500 to get 2500.
In simple words: Multiply the non-zero numbers and attach the zeros at the end.

Exam Tip: When multiplying numbers with trailing zeros, multiply the whole numbers first and then count and append the total number of zeros.

Question 1 b. \(4 \times 700 =\)
Answer: 2800
Calculation:
\(4 \times 7 = 28\)
Attach the two zeros from 700 to get 2800.
In simple words: Multiply 4 and 7, then put two zeros after it.

Exam Tip: Always double-check your basic multiplication tables (like \(4 \times 7 = 28\)) before placing the zeros.

Question 2 a. \(600 \times 4 =\)
Answer: 2400
Calculation:
\(6 \times 4 = 24\)
Attach the two zeros from 600 to get 2400.
In simple words: Multiply 6 and 4, then add two zeros at the end.

Question 2 b. \(2 \times 80 =\)
Answer: 160
Calculation:
\(2 \times 8 = 16\)
Attach the one zero from 80 to get 160.
In simple words: Multiply 2 by 8 to get 16, and add one zero.

Exam Tip: Pay close attention to whether there is one zero or two zeros in the multiplier.

Question 3 a. \(7 \times 40 =\)
Answer: 280
Calculation:
\(7 \times 4 = 28\)
Attach the one zero from 40 to get 280.
In simple words: Multiply 7 and 4, then place a zero at the end.

Exam Tip: Recall that \(7 \times 4 = 28\).

Question 3 b. \(300 \times 5 =\)
Answer: 1500
Calculation:
\(3 \times 5 = 15\)
Attach the two zeros from 300 to get 1500.
In simple words: Multiply 3 and 5, then put two zeros after it.

Exam Tip: Ensure you do not miss counting any zeros from the hundreds place.

Question 4 a. \(30 \times 5 =\)
Answer: 150
Calculation:
\(3 \times 5 = 15\)
Attach the one zero from 30 to get 150.
In simple words: Multiply 3 by 5 and write a zero behind it.

Exam Tip: Quick mental math helps save time in speed calculations.

Question 4 b. \(9 \times 60 =\)
Answer: 540
Calculation:
\(9 \times 6 = 54\)
Attach the one zero from 60 to get 540.
In simple words: Multiply 9 and 6, then add one zero.

Exam Tip: Memorize multiplication tables up to 10 for faster accuracy.

Question 5 a. \(800 \times 8 =\)
Answer: 6400
Calculation:
\(8 \times 8 = 64\)
Attach the two zeros from 800 to get 6400.
In simple words: Multiply 8 by 8 and put two zeros at the end.

Exam Tip: \(8 \times 8\) is 64; be careful not to confuse it with addition (\(8 + 8 = 16\)).

Question 5 b. \(3 \times 90 =\)
Answer: 270
Calculation:
\(3 \times 9 = 27\)
Attach the one zero from 90 to get 270.
In simple words: Multiply 3 and 9, then attach one zero.

Exam Tip: Check your tens place placement carefully.

Question 6 a. \(4 \times 300 =\)
Answer: 1200
Calculation:
\(4 \times 3 = 12\)
Attach the two zeros from 300 to get 1200.
In simple words: Multiply 4 and 3, then add two zeros.

Exam Tip: Always write the final number with correct comma separation (e.g., 1,200 or 1200).

Question 6 b. \(7 \times 20 =\)
Answer: 140
Calculation:
\(7 \times 2 = 14\)
Attach the one zero from 20 to get 140.
In simple words: Multiply 7 by 2 and put a zero at the end.

Exam Tip: Double check your single-digit multiplication facts.

Question 7 a. \(7 \times 100 =\)
Answer: 700
Calculation:
\(7 \times 1 = 7\)
Attach the two zeros from 100 to get 700.
In simple words: Any number multiplied by 100 simply takes two zeros at the end.

Exam Tip: Multiplying by powers of 10 is foundational for decimal and large number arithmetic.

Question 7 b. \(300 \times 3 =\)
Answer: 900
Calculation:
\(3 \times 3 = 9\)
Attach the two zeros from 300 to get 900.
In simple words: Multiply 3 and 3, then add two zeros.

Question 8 a. \(10 \times 8 =\)
Answer: 80
Calculation:
\(1 \times 8 = 8\)
Attach the one zero from 10 to get 80.
In simple words: Multiply 8 by 1 and put a zero behind it.

Exam Tip: Multiplying by 10 just shifts the digits one place to the left.

Question 8 b. \(8 \times 80 =\)
Answer: 640
Calculation:
\(8 \times 8 = 64\)
Attach the one zero from 80 to get 640.
In simple words: Multiply 8 and 8, then add one zero.

Exam Tip: Remember \(8 \times 8 = 64\).

Question 9 a. \(70 \times 7 =\)
Answer: 490
Calculation:
\(7 \times 7 = 49\)
Attach the one zero from 70 to get 490.
In simple words: Multiply 7 by 7 and attach one zero.

Exam Tip: Recall that \(7 \times 7 = 49\).

Question 9 b. \(700 \times 6 =\)
Answer: 4200
Calculation:
\(7 \times 6 = 42\)
Attach the two zeros from 700 to get 4200.
In simple words: Multiply 7 and 6, then put two zeros after it.

Exam Tip: Ensure all trailing zeros from the multiplier are correctly appended.

Question 10 a. \(9 \times 50 =\)
Answer: 450
Calculation:
\(9 \times 5 = 45\)
Attach the one zero from 50 to get 450.
In simple words: Multiply 9 and 5, then add one zero.

Exam Tip: Double check your five times table if needed.

Question 10 b. \(40 \times 3 =\)
Answer: 120
Calculation:
\(4 \times 3 = 12\)
Attach the one zero from 40 to get 120.
In simple words: Multiply 4 by 3 and attach a zero at the end.

Exam Tip: Always review your completed worksheet to ensure no signs or digits were miscopied.