# Year 5 Maths Challenge

This half term we have started to investigate prime numbers. A prime number only has 2 factors, and these factors are always 1 and itself.

Bronze: identify all the prime numbers to 100

Silver: identify if the following numbers are prime and explain; 97, 32, 107, 241.

Gold: is the number 1 234 837 prime? Explain your reasons

## 12 thoughts on “Year 5 Maths Challenge”

1. Osmaan Sharifi

all prime numbers up to 100
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,49,53,57,59,61,67,71,73,79,83,89,97

1234837 is a prime number because I done the chunking method and found out that it cannot be divided by all numbers except 1 and itself without leaving a remainder.

2. Ryan Chand

Then it’s a prime number

3. Ryan Chand

107 is a prime number because you can only divide it by 1 and 107.
97 is a prime number because you can only divide it by 1 and 97.
32 isn’t a prime number because when you divide it the factors are 16,8,4,2 and 1.
241 is a prime number because you can only divide it by 1 and 241.

You can know if the number is a prime number if you divide the numbers by 2,3,5,7 and 8.

4. Aleena Dean

BRONZE CHALLENGE: the prime numbers to 100 are:

2,3,5,7,11,13,17,19,23,31,37,39,41,43,47,53,59,61,67,71,73,79,83,89 and 97

SLIVER CHALLENGE:

97 is a prime number because you can only divide it by
1 and itself.
32 is not a prime number because you can divide it by 2 and 1 and itself which means it has 3 factors.
107 is a prime number because you can only divide it by 1 and itself and that means it has 2 factors.
241 is a prime number because you can only divide it by 1 and itself and that means it has 2 factors,

5. Amina Abbas

Bronze:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97 these are all of the prime numbers which do not belong in any of the time tables .

6. Samira Ali

silver
97 is a prime number because the only factors are 1 and 97.
32 is not a prime number because the only even prime number is 2.
107 is a prime number because it can only be divided by 1 and itself.
241 is a prime number because its only factors are 1 and itself.
gold
1 234 837 is a prime number because it can only be divided by 1 and itself.I know this because I used the bus stop method to divide it by 7,3,9 and 2.

7. Mehek Shah

Brone:2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97
Silver:
97 is a prime number because its only factors are 1 and itself.
32 is not a prime number because the only even prime number is 2.
107 is a prime number because it’s only factors are 1 and itself.
241 is a prime number because it’s only factors are 1 and itself.

8. Ibrahim El Safi

Gold challenge:

1 234 837 is prime because it can only be divided by itself or 1.I know this because I took on the challenge and saw if it can be divide or in the times table of 2 3 7 and 9 but it wasn’t/didn’t.

9. Mohammed Osman

2,3,5,7,11,13,17,19,23,31,37,39,41,43,47,53,59,61,67,69,71,
73,79,83,89 and 97.

97 is a prime number.
32 is not prime number.
107 is not a prime number.
241 is a prime number.

10. Ameena Mahmood

2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,
79,83,89,97.All these number are prime number which are
not in the any times table.

11. Astrid Ngodji

2,3,5,7,11,13,17,19,23,31,37,39,41,43,47,53,59,61,67,69,71,73,79,83,89,97

97 is a prime number
32 is not a prime number
107 is a prime number
241 is a prime number

1,234,837 is a prime number

12. Daniel Harrold

10,20,30,40,50,60,70,80,90,100. 5,15,20,25,30,35,45,50,55,60,65,70,75,80,85,90,95
2,12,22,32,42,52,62,72,82,92
7,57,77,97
1,11,21,31,41,51,61,71,81,91