Explanation

Checking prior knowledge helps the teacher connect the new lesson with what students already know.

It ensures that the foundation is strong before introducing new concepts.

Explanation

To find the LCM (Least Common Multiple) of 10, 16, and 25:

Prime factorization:

10 = 2 × 5

16 = 2⁴

25 = 5²

Now take the highest power of each prime:

2⁴ (from 16)

5² (from 25)

LCM = 2⁴ × 5² = 16 × 25 = 400

Explanation

Given x < 0 and y < z:

When multiplying both sides of y < z by x, the inequality sign flips because x is negative:

xy > xz

Explanation

"Condone" means to overlook or accept something wrong.

The sentence correctly reads: "He does not condone anti-social habits."

Explanation

Cations are positively charged ions. 

Cations are formed when a metal loses its electrons.

Explanation

A teacher acts as a guide, helping students understand concepts, develop skills, and shape their character.

While teachers can also be role models, their primary role is to guide learning and personal development.

Explanation

A child’s positive or negative attitude is largely shaped by their home, social, and emotional environment.

Family interactions, peer influence, and surroundings play a major role in attitude development.

Explanation

1 is not a prime because a prime number has exactly two distinct positive divisors (1 and itself), and 1 only has one.

1 is not composite because a composite number has more than two factors.

Explanation

"Calmed down" is the most natural and grammatically correct phrase for describing someone becoming less upset or emotional.

The sentence becomes: "After the attack, the woman calmed down quickly."

Explanation

In indirect speech, exclamation sentences are converted using "exclaimed" and a change of pronouns and verb tense.

The sentence "What a stupid fellow you are!" becomes "He exclaimed that what a stupid fellow I was."