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break it down into smaller parts: 8+7=15 15+6=21 21+5=26 26+4=30 30+3=33 33+2+1=36

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Q: What is the total of the digits 1-8 added together?
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Which two prime number add to make 18?

7 & 11 added together total 18.


What is a digit sum of a number?

To find the digit sum of a number you plus the first 2 numbers together, example:the number 18, 18 is made up of 2 digits 1 and 8.If you add the 2 digits together you get a total of 9.So that is the digit sum of 18.But if you use a higher number like 66 then the method has a small change.First if you add the two digits together it becomes 12.But 12 isn't a single digit sum.So again the 2 digits have to be added together to make a single digit sum.1+2=3 so 3 is the single digit sum for the number 66.


3924 is divisible by 3 false true?

3924 is divisible by 3 as the digits added together 3+9+2+4=18 is divisible by 3


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Assuming you mean consecutive numbers, the answer is 5, 6 and 7.


How do you calculate 8 20 18 21?

I assume you want the numbers added together? In which case, you simply total the numbers together. 8 + 20 + 18 + 21 = 67 If I've assumed wrongly, then more information is needed.


What two numbers added together equal -18?

-19 + 1 = -18


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5715 is not divisible by 2: the last digit is not an even number or 05715 is divisible by 3: as the last two digits when added together is a multiple of 35715 is divisible by 5: as the last digit is a 5 or 05715 is divisible by 9: as if u added all the digits of the number it will be divisible by 9, in this case 5 +7+1+5=18 and 18 is a multiple of 95715 is not divisible by 10: as the last digit is not a 0


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To find the product of 12 and 18, you simply multiply the two numbers together. 12 times 18 equals 216. This can be calculated by multiplying the tens digits (1 and 1) to get 1, then multiplying the ones digits (2 and 8) to get 16, and finally adding the two products together to get the final result of 216.


How can you tell if a number is divisible by 9?

Any number which is divisible by 9 contains digits which, when added together, are equal to 9 or a multiple of 9. For example, 63 is divisible by 9 because 6 + 3 = 9. 288 is divisible by 9 because 2 + 8 + 8 = 18 and 18/9 = 2.