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What are prime numbers from 1-50?
- 2,3,5,7
- 11,13,17,19
- 23,29
- 31,37
- 41,43,47
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What does it mean if a number is divisible by 2?
The number is even
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What does it mean if a number is divisible by 3?.
The sum of the digits of the number is a multiple of 3 (ex. 24 2+4=6 which is a multiple of 3)
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What does it mean if a number is divisible by 5?
The number ends in 0 or 5
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What does it mean if a number is divisible by 10?
the number ends in a 0
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What does it mean if a number is divisible by 4?
- The last 2 digits are a multiple of 4
- (ex the number 1984. 84 is a multiple of 4)
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What does it mean if a number is divisible by 6?
- the divisibility rules for 2 and 3 are met
- (an even number for which the sum of the digits is a multiple of 3)
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What does it mean if a number is divisible by 9?
sum of the digits is a multiple of 9
(ex 243 the sum 2+4+3=9 so 243 is a multiple of 9)
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perfect squares?
- Number Number
- Square
- 1 1
- 2 4
- 3 9
- 4 16
- 5 25
- 6 36
- 7 49
- 8 64
- 9 81
- 10 100
- 11 121
- 12 144
- 13 169
- 14 196
- 15 225
- 16 256
- 17 289
- 18 324
- 19 361
- 20 400
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How do you find mean?
sum of items in set/number of items in set
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what is median?
- middle term in a set of numbers,
- or average of 2 even numbers in a set
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what is mode?
# that shows up the most
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range?
difference between largest and smallest value
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