Current Affairs 1st Class

Category : 1st Class

BACK AND FORTH COUNTING

Back and Forth Counting

Understanding and applying basic mathematics is an essential skill set for a student to learn. In this chapter you will know about the back and forth counting.

Forth Counting

Look at the following figures:

In forth counting, we count from smaller to greater numbers.

•              Example:

Back Counting

            Look at the following figures:

In .back counting we count from greater to smaller numbers.

Reverse Counting

Reverse counting is back counting or counting backward. The reverse counting goes as given below:

What Comes before

In forth counting, smaller number always comes before greater number.

  Example:

Here,

\[[\,3\,]\] comes just before \[[\,4\,]\] &

\[[\,4\,]\] comes just before \[[\,5\,]\]

In forth counting

Numbers coming before \[[\,5\,]\] are \[[1]\,\,[2]\,\,[3]\,\,[4]\].

Numbers coming before \[[\,4\,]\] are \[[\,1\,]\,\,[\,2\,]\,\,[3\,]\].

•          Example:

Here,

\[[\,6\,]\] comes just before \[[\,5\,]\]

\[[\,5\,]\] comes just before \[[\,4\,]\]

In Back Counting,

Numbers coming before \[[\,0\,]\] are \[[\,1\,]\,\,[\,2\,]\,\,[\,3\,]\,\,[\,4\,]\,\,[\,5\,]\,\,[\,6\,]\]

Numbers coming before \[[\,1\,]\] are \[[\,2\,]\,\,[\,3\,]\,\,[\,4\,]\,\,[\,5\,]\]

What Comes After

Just remember that greater number always comes after smaller number in forth counting.

•           Example:

Here,

\[[\,9\,]\] comes just after \[[\,8\,]\]

\[[\,10\,]\] comes just after \[[\,9\,]\]

In forth counting,

Numbers coming after \[[\,8\,]\] are \[[\,9\,]\,\,\,[\,10\,]\,\,\,[\,11\,]\,\,\,[\,12\,]\,\,\,[\,13\,]\,\,\,[\,14\,]\]

Numbers coming after \[[\,9\,]\] are \[[\,10\,]\,\,\,[\,11\,]\,\,\,[\,12\,]\,\,\,[\,13\,]\,\,\,[\,14\,]\]

•          Example:

Here,

            \[[\,27\,]\] comes just after \[[\,28\,]\]

\[[\,28\,]\] comes just after \[[\,29\,]\]

In back counting,

Numbers coming after \[[\,29\,]\] are \[[\,28\,]\,\,\,[\,27\,]\,\,\,[\,26\,]\,\,\,[\,25\,]\]

Numbers coming after\[[\,28\,]\] are\[[\,27\,]\,\,\,[\,26\,]\,\,\,[\,25\,]\]

Counting in Tens

Look at the following:

One ten \[=1\,ten\,\,=\,\,[\,10\,]\]

Two tens \[=2\,ten\,\,=\,\,[\,20\,]\]

Three tens \[=3\,ten\,\,=\,\,[\,30\,]\]

Trick:

Just put a single zero (0) in place often.

One ten = 1 ten = 10

Two tens = 2 tens = 20

Three tens = 3 tens = 30

From the above given explanation, it is clear that while counting in tens, put number in the left side and a single zero (0) in the right side.

•           Example:

Now, it is clear that counting in 10's goes as:

10, 20, 30, 40, 50, 60, 70, 80, 90, 100,...................... so on.

Counting in Twenties

Look at the following:

One twenty = 1 twenty = [20]

Two twenties = 2 twenty = [40]

Three twenties = 3 twenty = [60]

•          Example:

Here, we double the two that becomes [4] and put it on the left, while the word twenties written in the right get replaced by zero (0).

Skip Counting

Skip counting is counting by a number that is not 1. eg. 3, 6, 9, 12,_____is an example of skip counting by 3.

Numbers and Their Name

Let us look at the following patterns:

Let us look at the number counting and their appropriate name as given below: