This page quickly reviews the numbers from `10` to `1000` and introduces *grouping* of `10` units to `1` ten. The grouping is further explained to understand units, tens, hundreds, etc. This is an important concept to understand numerical arithmetics.

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In this page, the following are explained

• *grouping* of `10` of units to `1` ten

• introduces the basics to representing numbers in place-value.

How many blocks are there in the picture?

- `10`
- `10`
- `2`

The answer is '`10`'

There are `10` blue color blocks in the picture. These blocks are packed into a purple block and marked `10`. In this course, the purple block is used to represent `10`.

Blue block represents `1` and the grouped purple block represent `10`. Consider that the smaller blue block is a lower place-value and the larger purple block is higher place-value.

Combining a `10` of lower place value into `1` of higher place value is *grouping*.

Which of the following is a meaning for the word "grouping"?

- joining and combining together
- joining and combining together
- ground level

The answer is "joining and combining together".

What is the term used to refer "join and combine together"?

- Pronunciation : Say the answer once

Spelling: Write the answer once

The answer is "grouping".

**Grouping**: `10` of a lower place value is combined to `1` of higher place value.

What number is represented in the picture?

- `11`
- `11`
- `2`

The answer is '`11`'

The purple block is used to represent ten and additional block represents `1`. So, the total is `11`.

What number is represented in the picture?

- `11`
- `12`
- `12`

The answer is '`12`'

What number is represented in the picture?

- `13`
- `13`
- `12`

The answer is '`13`'

What number is represented in the picture?

- `17`
- `14`
- `14`

The answer is '`14`'

What number is represented in the picture?

- `15`
- `15`
- `19`

The answer is '`15`'

What number is represented in the picture?

- `16`
- `16`
- `12`

The answer is '`16`'

What number is represented in the picture?

- `11`
- `17`
- `17`

The answer is '`17`'

What number is represented in the picture?

- `18`
- `18`
- `13`

The answer is '`18`'

What number is represented in the picture?

- `11`
- `19`
- `19`

The answer is '`19`'

**Numbers above `10`: ** The numbers above 10 are

`11` (eleven),

`12` (twelve),

`13` (thirteen),

`14` (fourteen),

`15` (fifteen),

`16` (sixteen),

`17` (seventeen),

`18` (eighteen),

`19` (nineteen).

What number is represented in the picture?

- `20`
- `20`
- `12`

The answer is '`20`'

What number is represented in the picture?

- `24`
- `24`
- `2`

The answer is '`24`'

What number is represented in the picture?

- `15`
- `32`
- `32`

The answer is '`32`'

What number is represented in the picture?

- `47`
- `47`
- `40`

The answer is '`47`'

What number is represented in the picture?

- `54`
- `54`
- `52`

The answer is '`54`'

What number is represented in the picture?

- `60`
- `65`
- `65`

The answer is '`65`'

What number is represented in the picture?

- Pronunciation : Say the answer once

Spelling: Write the answer once

The answer is 'sixty five'. Instead of laying out all the blocks, the representation gives the count of each of the block. The blocks are of sizes `1`, and `10`.

What number is represented in the picture?

- `77`
- `70`
- `70`

The answer is '`70`'

What number is represented in the picture?

- Pronunciation : Say the answer once

Spelling: Write the answer once

The answer is 'seventy'.

What number is represented in the picture?

- `89`
- `84`
- `84`

The answer is '`84`'

What number is represented in the picture?

- Pronunciation : Say the answer once

Spelling: Write the answer once

The answer is 'Eighty Four'.

What number is represented in the picture?

- `97`
- `97`
- `90`

The answer is '`97`'

What number is represented in the picture?

- Pronunciation : Say the answer once

Spelling: Write the answer once

The answer is 'ninety seven'.

**Numbers in the tens:**

`10`(ten),

`20`(twenty),

`30`(thirty),

`40`(forty),

`50`(fifty),

`60`(sixty),

`70`(seventy),

`80`(eighty),

`90`(ninety)

What number is represented in the picture?

- `10`
- `100`
- `100`

The answer is '`100`'

What number is represented in the picture?

- `10`
- `100`
- `100`

The answer is '`100`'

What number is represented in the picture?

- `36`
- `136`
- `136`

The answer is '`136`'

What number is represented in the picture?

- `721`
- `721`
- `21`

The answer is '`721`'

What number is represented in the picture?

- Pronunciation : Say the answer once

Spelling: Write the answer once

The answer is 'Seven hundred twenty one'. Instead of laying out the entire blocks, the representation gives the count of each of the block. The blocks are of sizes `1`, `10`, and `100`.

What number is represented in the picture?

- `721`
- `721`
- `21`

The answer is '`721`'. Instead of providing a pictorial representation of the blocks, the value is given in words. The values are hundreds, tens, and units, equivalently representing blocks of size `100` `10` and `1`.

Numbers are represented as sequence of digits. If `721` is given, the number of digits are counted as `3` and the number is read as seven hundred and twenty one.

What number is represented in the picture?

- `721`
- `721`
- `1000`

The answer is '`1000`'.

What is `1000` called?

- thousand
- thousand
- lakh

The answer is "thousand"

What number is represented in the picture?

- `1635`
- `5361`
- `5361`

The answer is '`5361`'

What number is represented in the picture?

- `28`
- `28,573`
- `28,573`

The answer is '`28,573`'

**Large Numbers : ** The digits in large numbers are

`1` (units),

`10` (tens),

`100`(hundreds),

`1,000`(thousands)

• `1000` thousands

• `10,000` ten thousands An example is given in the figure.

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