2nd Class

  Number Pattern     Number patterns involve how much a number is greater than the other given numbers or the relation between the numbers in a given pattern. Increasing order (Ascending order) Decreasing order pattern (Descending order)          Analyzing Pattern   See the examples of patterns given below:         Pattern is particular arrangement it is made in different styles for number and various shapes and sizes.           Take any three digit number in which the difference between first and last number must be more, then subtract the smaller number from the larger number. Add the resulting number more...

     Introduction     In this chapter we will learn about various patterns based on shape, size and numbers. From Class I, you know that patterns are particular arrangements or styles of objects.  

  Rectangle     In a rectangle: Opposite sides are equal; Opposite sides are parallel; All angles are equal   See the figure given below:     Here, AB = CD and AC = BD Also, angle A = angle B = angle C = angle = D        

• Line has negligible width.
• Triangle has three sides and three angles.
• Square has four equal sides.
• Opposite sides of a rectangle are equal and parallel.
• Square and rectangle are quadrilaterals.  

     

• Geometrical shapes are two, three of more dimensional.
• Geometry is the mathematical study of shapes, figures and position. It is useful in architecture and carpentry.  

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  Quadrilateral     A quadrilateral has 4 sides (edges) and 4 vertices (corner) The following are the quadrilaterals:    

  Square     A square has four equal sides and four equal angles.     In this picture side AB = BD = CD = AC, and angle A = angle B , angle C = angle D

    Triangle     A triangle has three sides and three angles. See the figure given below:  

   Angle     An angle is formed by meeting of two lines or an angle is formed when the two lines meet. The point where two lines meet is called vertex.  

    Lines Let's see the lines given below:      

   Introduction     Geometrical shapes are used for the construction of the geometrical figures. The basic geometrical figures are, line, line segments, angles, etc. This chapter includes the identification of the basic geometrical shapes.    

    Measurement of volume     The standard unit for the measurement of volume is liter. Volume of a liquid is measured in milliliters, liters and kilolitres. 1 liter\[=\text{1}\times \text{1}000=\text{1}000\] milliliters 2 liters\[=\text{2}\times \text{1}000=\text{2}000\] milliliters 1000 liters = 1 kilolitres       To obtain the volume of oil in liters how much quantity of oil is required in a container, which already contains 45 liters 900 milliliters of oil? (a) 500ml                                             (b) 100ml (c) 600ml                                              (d) 650ml     Answer (b) Explanations 45 liters 900 milliliters of oil becomes 46 liters when 100 milliliters is added to it.