Mathematics Sec 2 CA Remedial Task

Write 12 as a product of its prime factors.

• 2 × 2 × 3

• 3 × 3 × 2

• 2 × 6

• 4 × 3

Write 20 as a product of its prime factors.

• 2 × 2 × 5

• 2 × 5 × 5

• 4 × 5

• 2 × 10

Write 120 as a product of its prime factors.

• 2 × 2 × 2 × 3 × 5

• 2 × 2 × 3 × 5 × 5

• 2 × 3 × 4 × 5

• 2 × 2 × 2 × 5 × 5

Write 250 as a product of its prime factors.

• 2 × 5 × 5 × 5

• 2 × 2 × 5 × 5

• 5 × 5 × 10

• 2 × 25 × 5

Find the HCF and LCM of 24 and 36.

• HCF = 12, LCM = 72

• HCF = 6, LCM = 48

• HCF = 8, LCM = 144

• HCF = 18, LCM = 60

The HCF of two numbers is 2. The LCM of the two numbers is 12. What are the two numbers?

• 2 and 10

• 3 and 4

• 4 and 6

• 1 and 12

This is a multiplication pyramid. Each number is the product of the two numbers below. Find the number on the peak grid.

• 216

• -24

• -216

• 24

• 7 or -7

• 0 or 7

• -7 or 0

• 1 or -1

• 8

• 6

• 12

• 4

• 8 or -8

• 0 or 8

• -8 or 0

• 4 or -4