Numbers are the essential part of everyone's life. Number sense is referred as common and intuitive understanding about numbers. It includes knowledge of different types of numbers such whole numbers, real number, integers, odd numbers, even numbers, decimal numbers, fractions etc.

Number sense includes the skills of executing various operations on numbers. This is the ability to work systematically with numbers, their categorization, approximation, solving problems and basically having a well organized knowledge of numbers.**Few problems based on number sense are given below:****Problem 1:** A number when subtracted from 25 gives 12. Find the number.**Solution:** Let the number be x.

According to the question:

25 - x = 12

- x = 12 - 25

- x = - 13

x = 13

Required number is 13.**Problem 2:** Simply the following: $3 \times 5-4^{2} +18\div 2$**Solution:** $3\times5-4^{2}+18\div 2$

= $3\times5-16+18\div 2$

= $15-16+9$

= $-1+9$

= 8**Problem 3: **4% of a number is 200. Determine the number.**Solution:** Let the number is x.

4% $\times x = 200

$\frac{4}{100}$$\times x=200$

$x=200 \times$ $\frac{100}{4}$

x = 5000

Required number is 5000.**Problem 4:** Find one-third of three-fifth of 1000.**Solution:** Three-fifth of 1000 = $\frac{3}{5}$ $\times1000$

= 600

Now, one-third of 600 = $\frac{1}{3}$ $\times$ 600

= 200

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