398
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Divide the number by 100 and then multiply the answer by 5. add the number with the answer.
Add the digits together. The sum of the digits of 23 is 5.
You can add them.
7
the result is always even
656
Zero!
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The 11 finger trick is a math trick where you can quickly multiply numbers by 11. To use the trick, you separate the digits of the number you want to multiply by 11, add the two digits together, and place the result in between the original digits. This works because 11 is the same as 10 1, so when you add the two digits together and place the result in between, you are essentially multiplying the original number by 10 and then adding the original number to it.
Divide the number by 100 and then multiply the answer by 5. add the number with the answer.
if you add the digits of the number such as 81 8+1=9 every time, the digits of the number will add up to 9
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Add the digits together. The sum of the digits of 23 is 5.
You can add them.
Multiplying a 2-digit number by a 1-digit number involves multiplying the digits in the ones and tens place and then adding the products. Similarly, multiplying a 3-digit number by a 1-digit number follows the same principle, where you multiply the digits in the ones, tens, and hundreds place and then add the products. The main difference is that in the latter case, you are dealing with three sets of digits to multiply and add, whereas in the former, you only have two sets of digits.
The 11 finger trick is a mental math technique where you can quickly multiply numbers by 11. To use this trick, you separate the digits of the number you want to multiply by 11, add the digits together, and place the sum in the middle of the original number. This allows you to calculate the product of the original number and 11 without using traditional multiplication methods.