Friday's starter:

Fluent in 5

 

1)  1275 x 22 =

2)   What is 4/100 as a decimal?

3)   6³  -  9² =

4)   What are the factors of 24?

5)   2,594.9 ÷ 2 =

Main Activity

Prime numbers. Please complete at least one section of the sheet (A = challenge 1, B = challenge 2, C = challenge 3).

 

A prime number is any number that can only be divided by one and itself. 

 

Remember your tricks for working out prime numbers:

- Is the number even? If yes, it is not prime (unless it is the number 2)

 

- Do the digits add up to a multiple of 3?

257 - 2 + 5 + 7 = 14 therefore 257 is not a multiple of 3

 255 - 2 + 5 + 5 = 12 therefore 255 is a multiple of 3 because 12 is. 

 

- Does the number end in a 5? If yes it is not prime (unless it is the number 5)

 

- Is the number divisible by 7? If yes it is not prime (unless it is the number 7)