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.
A blue light flashes every 8 seconds.
A red light flashes every 12 seconds.
Both lights have just flashed together.
After how many seconds will both lights flash together?
8,16,24,32,40,48
12,24
After 24 seconds the lights will flash together.
