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1st Class

Numbers Up to 10

NUMBERS UP TO 10   Synopsis
  • The digits 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 are used to form numbers or numerals.
  • The numbers 1, 2, 3,..... used to count things are called counting numbers.
                                 
  • One, two, three .. are called number names o 1, 2, 3,.....
  • 1 is the smallest and 9 is the greatest one-digit counting numbers. All one digit numbers have only the ones place.
  • 10 is the smallest two digit counting number, written using the digits 0 and 1. Two more...
Catgeory: 1st Class

Ordinal Numbers

ORDINAL NUMBERS   Synopsis
  • The words that tell about the position of objects in a set are called positional numbers or ordinal numbers.
         
  • First, Second, Third, ..... are the ordinal numbers for 1, 2, 3, ......
  • The short forms of ordinal numbers first, second, third, fourth, ..... are 1st, 2nd 3rd 4th , ............
Catgeory: 1st Class

Numbers Up to 100

NUMBERS UP TO 100   SYNOPSIS
  • A two-digit number can be written in tens and ones.
e.g., 28 = 2 tens 8 ones Numbers upto 20:                         
  • Numbers upto 100:
  more...
Catgeory: 1st Class

Addition

Addition   Synopsis
  • Counting things together is called addition.
  • The words total, sum, add, more, in all, altogether etc., mean addition.
  • The symbol for addition is +, read as plus.
  • The numbers that are added are called addends.
  • The answer we get by adding two numbers is called sum.
     
Number Number Names Number of tens
10 Ten 1 ten
20 Twenty 2 tens
30
Note: The sum of two numbers is more than each of the numbers.
  A line with numbers at equal places on it is called a number line.          
Catgeory: 1st Class

Subtraction

SUBTRACTION   SYNOPSIS
  • Subtraction is the opposite of addition.
  • Taking away things is called subtraction.
  • The words difference, left, remaining, taken away, less etc., mean subtraction.
  • The symbol for subtraction is -, read as minus.
  • The number from which another number is taken away is called minuend.
  • The number that is taken away is called subtrahend.
  • The answer we get by subtracting a given number from the other is called difference.
           
more...
Catgeory: 1st Class

Measurement

MEASUREMENT (Length, Mass, Capacity)   Synopsis
  • Things are measured to find out how big or how heavy they are.
  • The distance between two points is called length.
  • Words used for length:
        (a) Height-length measured upwards.    (b) Distance - length measured between objects on same level. (c) Width - length measured from side to side. (d) Depth - length measured downwards.
  • Length of an object can be measured by comparing it with the length of a known object, or a ruler.
           
  • The heaviness of an object is called mass, which is usually called weight.
  • Weight of an object can more...
Catgeory: 1st Class

Time

TIME   SYNOPSIS
  • Time is measured using a clock.
  • A clock has numbers 1 to 12 on its face, a short hand called the hour hand and a long hand called the minute hand.
         
  • Some clocks have a third hand called the second hand.  
  • In 1 hour, the hour hand moves from one number to the next number on the clock.
  • In 1 hour, the minute hand goes once around the clock and comes back to its starting position.
  • When the hour hand is at 3 and the minute hand is at 12, the time is read as 3 o' clock or 3: 00.
  • We use 2 more...
Catgeory: 1st Class

Money

Money   Synopsis
  • Money is used for buying things we need.
  • In India, money is called rupees. Rs. is the symbol for rupees. Paise is written as p.
  • Indian money is in the form of coins and notes. The value of each coin or note is written on it.
                        more...
Catgeory: 1st Class

Shapes and Patterns

SHAPES AND PATTERNS   Synopsis              
  • Different objects in our surroundings are of different shapes. Some shapes you learnt in your previous class:
         
Square All sides are equal.
Triangle Sides may be equal or different.
more...
Catgeory: 1st Class

Picture Graphs

PICTURE GRAPHS   Synopsis
  • Facts about things around us is called data.
  • Data in the form of pictures is called a picture graph. It is easy to understand.
  • We can read, understand and come to some idea about a given data.
  • The ideas we get from the data is used for taking some decisions.
 
Catgeory: 1st Class

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