Prime Numbers
What are the first 5 prime numbers ?
2,3,5,7 and 11
What is the 9th triangular number ?
45
What is the equation for the 6th square number ?
6 times 6 is 36
What are the first 3 rectangular numbers?
2,6 and 12
How many prime numbers are in the 40s ? What are they?
3
41, 43, 47
What are the 4th to 8th triangular numbers?
10, 15, 21, 28, 36
What is the 4th square number ?
16
What are the first 4 rectangular numbers ?
2,6,12 and 20
What is the smallest prime number that you can find that is a sum of 3 prime numbers .
7
2 + 2 + 3
What is the 6th triangular number subtracted by the 5th?
6
What simple method can you use to find a square number ?
Times the number by itself
What is the 8th rectangular number ?
72
How many single digit prime numbers are there ?
4
2, 3, 5, and 7
Why are they called triangular numbers?
Because they can be expressed graphically with triangular arrangements.
What is the 4th through 9th square numbers ?
16 , 25 , 36 , 49 , 64 , 81
What are the first 5 equations for the first 5 rectangular numbers ?
1 times 2 , 2 times 3 , 3 times 4 , 4 times 5 , 5 times 6
True or False : All even numbers can be expressed as a sum of two prime numbers. Give one example.
True.
4 = 2 + 2
6 = 3 + 3 ...
`What position is 78 in?
12th
What is the 9th square number plus the 7th minus the 5th?
105
What are the first ten rectangular numbers ?
2 , 6 ,12, 20, 30, 42, 56, 72, 90, and 110