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Using the "Amazing Facts of Nine" trick, what is the product of 7 x 9?
- a)70
- b)63
- c)54
- d)81
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
Using the "Amazing Facts of Nine" trick, what is the product of 7 x 9?...
Understanding the "Amazing Facts of Nine" Trick
The "Amazing Facts of Nine" trick helps in quickly calculating the products of numbers multiplied by 9. Let's apply this trick to find the product of 7 x 9.
Step-by-Step Explanation
- Recognize the Trick:
- When multiplying a number by 9, the result can be derived by taking the number (in this case, 7) and subtracting 1, which gives you 6.
- This '6' becomes the first digit of the answer.
- Calculate the Second Digit:
- To find the second digit, subtract 6 (the first digit) from 9 (the total of digits in 9).
- 9 - 6 = 3.
- This '3' becomes the second digit of the answer.
- Combine the Digits:
- Now, combine the two digits you've found: 6 and 3.
- This gives you 63.
Final Result
- Therefore, the product of 7 x 9 is 63, which corresponds to option 'B'.
Conclusion
Using the "Amazing Facts of Nine" trick simplifies and speeds up multiplication, particularly with the number 9. This method not only aids in understanding but also enhances mental math skills, making calculations easier for young learners.
The "Amazing Facts of Nine" trick helps in quickly calculating the products of numbers multiplied by 9. Let's apply this trick to find the product of 7 x 9.
Step-by-Step Explanation
- Recognize the Trick:
- When multiplying a number by 9, the result can be derived by taking the number (in this case, 7) and subtracting 1, which gives you 6.
- This '6' becomes the first digit of the answer.
- Calculate the Second Digit:
- To find the second digit, subtract 6 (the first digit) from 9 (the total of digits in 9).
- 9 - 6 = 3.
- This '3' becomes the second digit of the answer.
- Combine the Digits:
- Now, combine the two digits you've found: 6 and 3.
- This gives you 63.
Final Result
- Therefore, the product of 7 x 9 is 63, which corresponds to option 'B'.
Conclusion
Using the "Amazing Facts of Nine" trick simplifies and speeds up multiplication, particularly with the number 9. This method not only aids in understanding but also enhances mental math skills, making calculations easier for young learners.
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Community Answer
Using the "Amazing Facts of Nine" trick, what is the product of 7 x 9?...
When using the "Amazing Facts of Nine" trick for 7 x 9, the tens digit is one less than 7 (which is 6), and the tens digit plus the ones digit always equals 9. So, the answer is 63, and you can verify it by checking that 6 + 3 equals 9.
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Using the "Amazing Facts of Nine" trick, what is the product of 7 x 9?a)70b)63c)54d)81Correct answer is option 'B'. Can you explain this answer?
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