Prime & Factors Quiz

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Prime numbers and factors game

Créé par

ANUP SINGH

India

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Prime & Factors Quiz


Prime & Factors QuizVersion en ligne Prime numbers and factors game par ANUP SINGH 1 What is a prime number? a Has exactly two even factors b Can be divided by any number c Only divisible by 1 and itself d Is a multiple of every number 2 Which is a factor of 36? a 9's digit sum is 9 b 6 c 11 d 7 3 Which number is a multiple of 9? a 27 b 4 c 13 d 25 4 What is the HCF (GCD) of 24 and 36? a 24 b 6 c 18 d 12 5 What is the LCM of 14 and 20? a 28 b 140 c 34 d 60 6 Are 8 and 15 coprime (co-prime)? a No, gcd is 8 b They share factor 5 c No, gcd is 4 d Yes, gcd is 1 7 Prime factorisation of 60 is? a 3 × 20 b 2 × 3 × 5 c 2 × 2 × 15 d 2^2 × 3 × 5 8 Which statement is true? a If a is a multiple of b, then a is a factor of b b Factor and multiple are the same c Every number is a multiple of 1 d If a is a factor of b, then b is a multiple of a 9 What is a common multiple of 3 and 5? a 8 b 7 c 15 d 9 10 Smallest prime factor of 91? a 7 b 11 c 13 d 17 Feedback 1 Prime numbers have exactly two distinct positive factors: 1 and the number itself. 2 6 × 6 = 36, so 6 is a factor; 7, 11 are not factors of 36. 3 A multiple of 9 is 9 × n; 27 = 9 × 3. 4 Common factors: 1,2,3,4,6,12; largest is 12. 5 LCM is the smallest common multiple; 140 is divisible by 14 and 20. 6 8 and 15 share no common prime factors; gcd = 1. 7 60 = 2 × 2 × 3 × 5, i.e., 2^2 × 3 × 5. 8 A factor of b means b is a multiple of that factor. 9 Common multiples include 15, 30, 45, etc.; 15 is the smallest positive one. 10 91 = 7 × 13; smallest prime factor is 7.

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Prime & Factors Quiz

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À propos de cette activité

Créé par

Téléchargez la version pour jouer sur papier

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Prime & Factors QuizVersion en ligne

par ANUP SINGH

What is a prime number?

Which is a factor of 36?

Which number is a multiple of 9?

What is the HCF (GCD) of 24 and 36?

What is the LCM of 14 and 20?

Are 8 and 15 coprime (co-prime)?

Prime factorisation of 60 is?

Which statement is true?

What is a common multiple of 3 and 5?

Smallest prime factor of 91?

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