Prime numbers Flashcards
What are the first 8 prime numbers?
2,3,5,7,9,11,13,17
Write 6 as a product of primes.
6=3*2
Write 10 as a product of two primes.
10=5*2
write 21 as a product of two primes.
21=3&7
Write 30 as a product of three primes.
30=235
Write 66 as a product of three primes.
66=3211
Write 77 as a product of primes.
77=7*11
Write 48 as a product of primes.
48=22232
Write 140 as a product of primes. Write your answer in its simplest form.
140=2^257
Write 495 as a product of primes.
495=1153^2
Express 392 in the form of 392=2n*7m. Where n and m are whole numbers.
392=22277
2^3*7^2
Write down the first five multiples of 3.
3,6,9,12,15
Write down all the factors of 16.
1,2,4,8,16
What is a factor?
What is a prime number?
What does it mean by “sum”?
A factor is a number or algebraic expression that divides another number or expression evenly—i.e., with no remainder. For example, 3 and 6 are factors of 12 because 12 ÷ 3 = 4 exactly and 12 ÷ 6 = 2 exactly.
A prime number is a number that is divisible only by itself and 1.
The sum of two numbers is the answer you get when you add them both together. So the sum of 5 and 4 is 9.
A bus to Belfast leaves Antrim Bus Station every 25 minutes.
The first bus each day leaves at 7am.
Darren wants to get a bus after 8am.
What time is the first suitable bus?
7am takes 25 minutes which is 7.25 then 7.50 then 8.15
the first suitable bus is the 8.15am bus.
