Current Affairs 1st Class

Category : 1st Class

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.

A line with numbers at equal places on it is called a number line.

• We can add numbers using a number line. e.g., 3 + 4

• We can also use our fingers, draw lines and count objects to add numbers.

Adding numbers by writing them in a line (across) is called horizontal addition, e.g., 5 + 3 = 8  (Across)

• Adding numbers by writing them one below the other (down) is called vertical addition.

• Addition using Ones: Add the numbers and write the sum.

• Addition using Tens and Ones: Add the ones first, write the sum and then add the tens.

e.g., (a)               (b)        

Adding 0 to a number gives the same number as the sum. e.g., 6 + 0 = 6