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Earn +20 ptsQ: How do you write the number 427 as groups of tens and ones only?
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Continue Learning about Basic Math
What digits can be in the ones place of a number that has 5 as a factor?
0 or 5
How many positive prime numbers have a ones digit of 5?
Only one positive prime number has a 5 in the ones digit. That prime number is 5. All other numbers with a 5 in the ones digit are composite because they will be divisible by 5.
You are a number between 60 and 100 your ones digit is two less than your tens digit you are a prime number what number are you?
97The only candidates are 64, 75, 86, and 97. 97 is the only prime in that group.
Are all numbers that have 2 in the ones place composite?
Yes except for 2 on its own which is the only even prime number
How can you tell 32 and 95 are not prime numbers without finding their factors?
32 is an even number (look at the ones place). The only even prime is 2. 95 has 5 as a factor (again look at the ones place). Multiples of 5 have a 0 or 5 in the ones place.That is how you figer out if 32 and 95 in not a prime number.
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