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How do you multiply a number by 5 when the number is odd?
- a)Divide the number by 2 and add 2.
- b)Subtract 1 from the number, then divide by 2.
- c)Divide the number by 3.
- d)Multiply the number by 10 and then divide by 2.
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
How do you multiply a number by 5 when the number is odd?a)Divide the ...
Explanation:
To multiply a number by 5 when the number is odd, we can follow the given steps:
Step 1: Subtract 1 from the number
When we subtract 1 from any odd number, we get an even number. For example, if the given number is 7, subtracting 1 gives us 6.
Step 2: Divide the result by 2
After subtracting 1, we divide the result by 2. In the previous example, dividing 6 by 2 gives us 3.
Step 3: Final result
The final result is the number obtained after dividing by 2 in step 2. In our example, 3 is the final result.
Explanation in detail:
Let's take an example to understand this concept further. Suppose we have an odd number, let's say 9, and we want to multiply it by 5.
Step 1: Subtract 1 from the number
9 - 1 = 8
Step 2: Divide the result by 2
8 ÷ 2 = 4
Step 3: Final result
The final result is the number obtained after dividing by 2 in step 2, which is 4 in our example.
Verification:
To verify if the final result is correct, we can multiply it by 5 and check if it matches the original odd number.
4 × 5 = 20
The original odd number was 9, and after following the steps, we obtained 20, which is indeed 9 multiplied by 5.
Conclusion:
To multiply a number by 5 when the number is odd, we can subtract 1 from the number and then divide the result by 2. This method ensures that we obtain the correct result without directly multiplying the odd number by 5.
To multiply a number by 5 when the number is odd, we can follow the given steps:
Step 1: Subtract 1 from the number
When we subtract 1 from any odd number, we get an even number. For example, if the given number is 7, subtracting 1 gives us 6.
Step 2: Divide the result by 2
After subtracting 1, we divide the result by 2. In the previous example, dividing 6 by 2 gives us 3.
Step 3: Final result
The final result is the number obtained after dividing by 2 in step 2. In our example, 3 is the final result.
Explanation in detail:
Let's take an example to understand this concept further. Suppose we have an odd number, let's say 9, and we want to multiply it by 5.
Step 1: Subtract 1 from the number
9 - 1 = 8
Step 2: Divide the result by 2
8 ÷ 2 = 4
Step 3: Final result
The final result is the number obtained after dividing by 2 in step 2, which is 4 in our example.
Verification:
To verify if the final result is correct, we can multiply it by 5 and check if it matches the original odd number.
4 × 5 = 20
The original odd number was 9, and after following the steps, we obtained 20, which is indeed 9 multiplied by 5.
Conclusion:
To multiply a number by 5 when the number is odd, we can subtract 1 from the number and then divide the result by 2. This method ensures that we obtain the correct result without directly multiplying the odd number by 5.
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Community Answer
How do you multiply a number by 5 when the number is odd?a)Divide the ...
To multiply a number by 5 when the number is odd, first subtract 1 from the number, and then divide the result by 2. The ones digit will always be 5. For example, to multiply 7 by 5, subtract 1 to get 6, then divide by 2 to get 3, and the answer is 35.
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Solutions for How do you multiply a number by 5 when the number is odd?a)Divide the number by 2 and add 2.b)Subtract 1 from the number, then divide by 2.c)Divide the number by 3.d)Multiply the number by 10 and then divide by 2.Correct answer is option 'B'. Can you explain this answer? in English & in Hindi are available as part of our courses for Class 1.
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