prime-composite-lcm-hcf-l1 MCQ — 10 Practice Questions with Answers

Explanation

This is the R5 inclusive-pedagogy item. Inclusion does not mean removing mathematics; it means changing access. Tara can still identify factors, common factors and HCF by using reachable cards, calling answers, or managing the marker for the group.

Explanation

Asha should first ask how many factors the number has. Since 1 has only one factor, it is neither prime nor composite. This is a frequent REET trap because candidates remember that counting starts at 1 but forget the definition of prime and composite numbers.

Explanation

For 8 and 12, the common factors are 1, 2 and 4, so HCF is 4. The common multiples begin at 24, so LCM is 24. Meena can also check that HCF times LCM equals 8 times 12.

Explanation

The multiples of 4 are 4, 8, 12, 16 and so on. The multiples of 6 are 6, 12, 18 and so on. The first shared number is 12, so Joseph should mark 12 as the LCM.

Explanation

This item checks two classic facts together. In Meena's revision card, 2 should be marked as the only even prime, and 9 should be marked composite because 3 divides it exactly. The option that relies on odd or even alone is unsafe.