Counting Numbers from 1 to 100 - Learning Concepts
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Numbers

Counting Numbers

We use numbers to count anything. The numbers starting from 1 to 100 and beyond 100, are used for counting. These are called counting numbers.

G1_1_CoN_1to10

There are mainly two ways of counting-

  1. Counting Forward
  2. Counting Backward

Counting Forward:

In counting forward, we count on by 1. Each number is one more than the previous number.

Example:

G1_1_CoN_frog

The frog is jumping on the numbers in forward direction. Each jump is one more than the previous jump.

  • Forward counting is useful in finding numbers that come after.
  • In forward counting, a bigger number always comes after a smaller number.

Example:

G1_1_CoN_Q1749

Here, we need to find out the number that comes after:

a. 17 b. 49

After counting forward the given numbers, we get:

G1_1_CoN_A1749

Skip Counting:

To count many things quickly, we count forward by the numbers other than 1. In this method, we keep adding the same number each time to the previous number.

Count forward by 2’s:

In this method, we count forward in 2. We count forward by skipping one number in between the previous and the next number.

Example:

27 29 ? ? ?

Here, we need to count the numbers in forward direction by skipping one number in between like the following:

G1_1_CoN_CF2

So, the correct answer is:

27 29 31 33 35

Count forward by 5’s:

In this method, we count forward by 5. We count forward by skipping four numbers in between the previous and the next number.

Example:

5 10 15 ? ? ?

Count the five numbers from 5. We get the number 10. Again, count the five numbers from 10. We get the number 15.

G1_1_CoN_Cf5

So, the correct answer is:

5 10 15 20 25 30
  • In the same fashion we can count forward in 3’s, 4’s, 6’s, 10’s, etc.

Counting Backward:

In counting backward, we count down by 1. Each number is one less than the previous number. number decreases in backward counting.

  • Backward counting is useful in finding numbers that come before.
  • In backward counting, a smaller number always comes after a bigger number.

Example 1:

G1_1_CoN_Cb7663

Here, we need to find the number that comes before:

a. 76 b. 63

After counting numbers backward, we get:

G1_1_CoN_Cb7663A

Sometimes we use backward counting to get the answers for the numbers, that are increasing.

Example 2:

? ? ? 85 87

Here, we need to count the numbers backward by skipping one number in between like the following:

G1_1_CoN_Cb7987

So, the correct answer is:

79 81 83 85 87

Count backward by 2’s:

In this method, we count backward in 2. We count backward by skipping one number in between the previous and the next number.

Example:

18 16 14 ? ? ?

Here, we need to count the numbers in backward direction by skipping one number in between like the following:

G1_1_CoN_Cb2

So, the correct answer is:

18 16 14 12 10 8

Count backward by 5’s:

In this method, we count backward in 5. We count in backward direction by skipping three numbers in between the previous and the next number.

30 25 20 ? ? ?

Here, we need to count the numbers in backward direction by skipping four numbers in between like the following:

G1_1_CoN_Cb5

So, the correct answer is:

30 25 20 15 10 5
  • In the same fashion we can count backward in 3’s, 4’s, 6’s, 10’s, etc.

Did you know?

The word "hundred" is derived from the Old Norse word
"hundrath," which means 120, not 100.

Fun fact:

Forty is the only number name in English whose letters appear in correct alphabetical order.

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