21.

The mean of range, mode and median of the data 4, 3, 2, 2, 7, 2, 2, 0, 3, 4, 4, is

• 4

• 3

• 5

• 2

LCM of 22, 54, 135 and 198 is

• 2² x 3³ x 5 x 11

• 2³ x 3² x 5 x 11

• 2 x 3³ x 5 x 11

• 2² x 3³ x 5 x 11

Which one of the following statements is correct?

• Sum of two prime numbers is always a prime number

• '1' is the smallest prime number

• A composite number can be odd

• There is no even prime number

The product of integers between - 7 and - 3 is

• 120

• - 360

• - 120

• 840

As per NCF 2005, the goal of Mathematics teaching in school curriculum is that children learn 'Important Mathematics' Important Mathematics implies

• understanding appropriate use of learnt mathematical techniques

• solving mathematical games and puzzles

• verifying geometrical theorems in Maths lab

• knowing mathematical procedures and algorithms

The term, 'Mathematical tools' refers to

• calculators, rulers, tape measures, protractors, compass, etc

• charts based on formulae and concepts, graph papers, dotted sheets, etc

• all types of materials including language, written symbols, meaningful instructions to establish their purpose

• physical material like geo-board and 3 D models, cubic rods, etc

A learner exhibiting difficulty in sorting, recognising patterns, orienting numbers and shapes, telling time and measurement may have dyscalculia with difficulty in

• language processing

• visual-memory

• visual-motor coordination

• visual-spatial skills

Read the following question from class VI textbook. "Write a pair of integers whose sum gives a negative integer."

The above question refers to

• Reflective question

• Closed ended question

• Multi-disciplinary question

• Open ended question

One of the factors of

$4{\mathrm{x}}^2 + {\mathrm{y}}^2 + 14\mathrm{x} - 7\mathrm{y} - 4\mathrm{xy} + 12 = ?$

• 2x + y + 4

• 2x - y - 3

• 2x + y - 4

• 2x - y + 3

$\mathrm{In} \mathrm{standard} \mathrm{form}, 0.00001278 \mathrm{is} \mathrm{expressed} \mathrm{as} \mathrm{k} \times {10}^{\mathrm{n}}. \mathrm{The} \mathrm{value} \mathrm{of} \left(\mathrm{k} + \mathrm{n}\right) \mathrm{is}$

• 3.278

• - 3.278

•  - 3.278

• 4.722