inspire nurture achieve
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)
