G7 MATHS : PRIMES, HCF, AND LCM

Which stores use prime numbers ?

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0 and 1 neither prime nor composite, why ?

• because 0 has infinite factors except 0

• because 1 only has 1 factor, itself

• because 0 has two factors only

• because 1 is a prime number

If a whole number is not prime, then it must be composite.

• True

• False

If p and q are whole numbers, p×q = 7,

find the value of p+q.

Please type the answer number without any spacing, for example: "2"

 $∛1728$  Find the value using prime factorisation

•  $2^2\times3$  
  

•  $2^2\times3^2$  

•  $2\times3^2$  
  

• 14

Find the greatest whole number (HCF) that will divide both 345 and 360 exactly.

345 = 3 x 5 x 23 

360 =  $2^3\times3^2\times5$  

• 3

• 6

• 9

• 15

Find the lowest common multiple (LCM) of 180 and 48.

180 = 2² x 3² x 5

  48 = 2⁴ x 3 

• 180

• 360

• 540

• 720

Canteen A, canteen B and canteen C repeat their lunch menus every 8 days, 10 days, and 12 days respectively. All three canteens serve soup today. How many days later will all canteens serving soup again?

• 30

• 90

• 120

• 150

95 boys and 115 girls had to be equally divided into as many groups as possible such that every group had the same number of boys and girls. By using HCF, find the greatest number of groups that can be formed.

• 25

• 9

• 5

• 15

Do you want additional 5 points for free, no terms and conditions ?

• Yes

• No