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What is the number theory for figurng out what is divisible by 7?
First of all, it is the one that is probably not even worth doing. It is honestly easier in most cases to just try it! To determine if a number is divisible by 7, take the last digit off the number, double it and subtract the doubled number from the remaining number. If the result is evenly divisible by 7 (e.g. 14, 7, 0, -7, etc.), then the number is divisible by seven. This may need to be repeated several times.
You are a odd number between 120 and 150 that is not divisible by 3 5 7 or 9 who are you?
'121'. 121/3 = 40.3333..... Not divisible. 121/5 any number that does not end in '5' or '0' is not divisible by '5' 121/7 = 17 3/7 Not divisible. 121/9 any number whose digits do not sum to nine is not divisible by '9' ; 1+2+1 = 4
The number 630 is divisible by what single - digit numbers?
630 is divisible by...2 or 3 or 5 or 6 or 7 or 9. your welcome
How many 3 digit numbers are divisible by 7?
The smallest 3-digit multiple of 7 is 105 = 15*7 The largest 3-digit multiple of 7 is 994 = 142*7 So there are 142-14 = 128 3-digit multiples of 7, ie 128 3-digit numbers that are divisible by 7.
What are all the numbers less than 1000 that are divisible by 2 3 5 and 7?
Check the Fibonacchi number sequences for 2, 3, 5, & 8 (7 is not a Fibonacchi number).
