Averages
What is the formula used to find out the average of a group of numbers?
If a group contains five numbers and the average of the numbers is 17, what is the sum of the numbers?
If the average of a group of numbers is 24 and the sum of the numbers is 192, how many numbers are there?
Divisibility Rules
How do you know if a number is divisible by 3?
How do you know if a number is divisible by 4?
How do you know if a number is divisible by 5?
How do you know if a number is divisible by 6?
How do you know if a number is divisible by 7?
How do you know if a number is divisible by 9?
Is 47 a prime number?
Is 117 a prime number?
Is 981,495 a prime number?
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Averages
ReplyDeleteWhat is the formula used to find out the average of a group of numbers?
(Sum of numbers/# of numbers)
If a group contains five numbers and the average of the numbers is 17, what is the sum of the numbers?
85
If the average of a group of numbers is 24 and the sum of the numbers is 192, how many numbers are there?
8
Divisibility Rules
How do you know if a number is divisible by 3?
Sum of the digits is divisible by 3
How do you know if a number is divisible by 4?
Last two digits are divisible by 4
How do you know if a number is divisible by 5?
Last digit is either a 0 or a 5
How do you know if a number is divisible by 6?
Number is even and divisible by 3
How do you know if a number is divisible by 7?
Number divides evenly by 7 (there is no shortcut)
How do you know if a number is divisible by 9?
Sum of the digits is divisible by 9
Is 47 a prime number?
Yes
Is 117 a prime number?
No (divisible by 3, 9, etc.)
Is 981,495 a prime number?
No (divisible by 3, 5, etc.)