Tens and Ones - Orchids The International School

Tens and Ones - Orchids The International School

Numbers

Tens and Ones

A number can be made of a single digit, two digits, or more than two digits.

If a number is made of two digits, we group the number in Tens and Ones to make the counting/calculations easier.

Example

Question:Tanmay wants to count all the books on the bookshelf. But it’s difficult for him to count all the books. If there are 94 books on the bookshelf, group them in tens and ones to help him count the books.

G1_1_Tens & ones_books.png

Answer: 94 books can be grouped in tens and ones as follows:

G1_2_Tens & ones_10 books.png

Now he can count the number of books as:

G1_3_Tens & ones_10 to 90.png

So, there are 90 books in 9 groups, adding remaining 4 individual books it will give:

90 books and 4 books = 94 books

Tens and Ones as Place Value:

When we have more than 9 items, write them in two columns ‘Tens’ and ‘Ones’.
In the Tens column we write down how many "tens" we have, followed by the remaining items in the ones column.

G1_4_Tens & ones_9 and 4.png

A ‘Ten’ indicates bundle or group of 10 individuals or singles.
1 Object = 1 Ones
10 Ones = 1 Ten
If there is a group of 10 Tens, we call it Hundreds.
10 Tens = 1 Hundred

G1_5_Tens & ones_100.png

Order of place value (Once, Tens & Hundreds)

Ones, Tens and Hundreds from right to left are written as follows.

G1_6_Tens & ones_hundreds.png

• Place value of One-digit numbers

All One-digit numbers are smaller than 10. A single digit number cannot make a group of 10.

• Place value of Two-digit numbers

The number 10 is the first and the smallest two-digit number.

Let’s take 10 pencils.

G1_7_Tens & ones_pencil.png

Now make a group of 10 pencils.

G1_8_Tens & ones_banches of https://www.orchidsinternationalschool.com/wp-content/uploads/2022/04/G1_8_Tens-_-ones_banches-of-pencil.pngpencil.png

We can make only 1 group. It represents 1 Ten. But there is no single pencil remaining. It indicates 0 ones.
So, the number 10 can write as:

G1_9_Tens & ones_10.png

Similarly, we can write representation of the all two-digits numbers.

Example

If we take 21 pencils, we can make 2 groups of 10 pencils that can be represented as 2 Tens.
1 remaining pencil can be represented as 1 Ones.

G1_10_Tens & ones_pencil 3 column.png

2 Tens and 1 Ones = 21

We can write 21 as:

G1_11_Tens & ones_21.png

• Place value of 100

We can represent 100 as 10 groups of Tens.

G1_12_Tens & ones _banches pencil.png

We cannot write 100 as:

G1_13_Tens & ones_10cross.png

We use the hundreds place. The number 100 is written as:

G1_14_Tens & ones_Hundreds 100.png

100 is the first and smallest three-digit number.

Misconception:

Do not write the numbers at the place value table from the left. If we have to write the numbers 7, 12 and 70. Don’t write as:

G1_15_Tens & ones_box cross.png

The correct way is: Always write the numbers from right to left.

G1_16_Tens & ones_box 17.png

G1_17_Tens & ones_did you know.png

G1_18_Tens & ones_mindmap.png

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