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What is the largest prime number less than 1000?
997. To test that 997 is prime, we only need to test values up [997^.5], so up to 31. Using divisibility rules, we can immediately eliminate several possible divisors. Rule for 7: If you have a number, separate the last digit from the proceeding ones. Subtract twice the last digit from the number created from slicing off the last part. if that's divisible by seven, the whole number is. For example, take 343. 34-2(3) is 28, which is divisible by 7, so 343 is divisible by 7 Rule for 3: sum of digits is divisible by 3. Rule for 2: last digit is divisible by 2. Rule for 2^n: last n digits form a number that is divisible by 2^n Rule for 5: last digit is 5 or 0. Rule for 11: Difference of alternating sums of the digits, 432113 is divisible by 11 because (4+2+1)-(3+1+3) is divisible by eleven. Rule for 9: sum of digits is divisible by 9. Trying 13, 17, 19, 23, and 29, we see these all fail. So 997 is indeed prime.
If 297 equals 100 percent what percent is 203?
203 / 297 = 0.6835 = 68.35% or (taking into account the rule of significant figures) 68.4%
What are the First 4 multiples of 9?
4, 8, 12, 16, 20, 24, 28, 32, and 36 are the first 9 multiples of 4.
How can you tell that 42 is divisible by 3?
To determine if 42 is divisible by 3, you can add up the digits of 42 (4 + 2 = 6) and check if the sum is divisible by 3. Since 6 is divisible by 3, then 42 is also divisible by 3. This is based on the rule that a number is divisible by 3 if the sum of its digits is divisible by 3.
When comparing decimal what do you do?
You line the numbers up, one below the other, so that the decimal points are in the same column. You compare the digits in the leftmost column. If one of the digits is large than the other, then that number is bigger. If they are the same, then you move to the next column on the right and repeat the comparisons.There is, however, one exception to this rule. If any number ends with a recurring 9, that decimal number must be rounded (up) to the last digit before the 9s start. That is 3.564999... recurring should be written as 3.565 for the comparisons. This does not apply to any other digit that might recur.
