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Презентация на тему: «Reading & writing numbers». Автор: Manager. Файл: «Reading & writing numbers.ppt». Размер zip-архива: 156 КБ.

содержание презентации «Reading & writing numbers.ppt»
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Numbers can be written in 2 ways – FIGURES or WORDS.

FIGURES use 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 and may even use – and . Examples include 34, 1063, 0.75, -25

WORDS use letters, and usually take longer to write. Examples include twelve, seventy-one, one million.

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FIGURES are made up of DIGITS (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) and are usually easy to write, but can be tricky to say or write in WORDS.

In order to put FIGURES into WORDS, we must try to imagine that the number is in a PLACE VALUE table like this one.

Hundred

Ten

Unit

3

The number 147 would be written in this way:

And the number 409 would be written in this way:

Hundred

Ten

Unit

1

4

7

Hundred

Ten

Unit

4

0

9

4

In order to say our numbers we need to follow a few simple rules. If you remember how to write 1 – 20 in words, most of the rest of the numbers are easy. 1 – one 6 – six 11 – eleven 16 - sixteen 2 – two 7 – seven 12 – twelve 17 - seventeen 3 – three 8 – eight 13 – thirteen 18 - eighteen 4 – four 9 – nine 14 – fourteen 19 - nineteen 5 – five 10 – ten 15 – fifteen 20 - twenty

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In order to say our numbers we need to follow a few simple rules. Other words you will need to know are: 30 – thirty (not threety) 80 – eighty 40 – forty (not fourty) 90 - ninety 50 – fifty (not fivety) ?00 - …hundred 60 – sixty ? 000 - …thousand 70 – seventy ? 000 000 - …million

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In order to say our numbers we need to follow a few simple rules. All TWO-DIGIT numbers higher than 20 have a hyphen in-between them (unless they end with a 0). 45 – forty-five 71 – seventy-one Watch out for 5 digit numbers! 54 875 – fifty-four thousand, eight hundred and seventy-five

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In order to say our numbers we need to follow a few simple rules. If a column has a 0 in it, you don’t need to say anything for that column. 500 – Five hundred (not … and noughty-nought!) 603 – Six hundred and three 2007 – Two thousand and seven

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Going back to our table, we can use our rules to name these numbers.

One hundred and forty-seven

Hundred

Ten

Unit

1

4

7

One hundred

forty

seven

9

Going back to our table, we can use our rules to name these numbers.

Four hundred and nine

Hundred

Ten

Unit

4

0

9

four hundred

nine

10

Have a think about how to write the following numbers: 117 – 591 – 4 921 –

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Did you get it? 117 – One hundred and seventeen 591 – 4 921 –

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Did you get it? 117 – One hundred and seventeen 591 – Five hundred and ninety-one 4 921 –

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Did you get it? 117 – One hundred and seventeen 591 – Five hundred and ninety-one 4 921 – Four thousand, nine hundred and twenty-one.

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How about 23 580 ? How would you attempt this one?

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Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

16

How about 23 580 ? Put the digits in…

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

2

3

5

8

0

17

How about 23 580 ? Work out the WORDS

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

2

3

5

8

0

Twenty thousand

Three thousand

Five hundred

eighty

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How about 23 580 ? Try to put them together.

Twenty thousand and three thousand become Twenty-three thousand

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

2

3

5

8

0

Twenty thousand

Three thousand

Five hundred

eighty

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How about 23 580 ? Try to put them together.

Remember that there is nothing in the last box!

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

2

3

5

8

0

Twenty-three thousand

Twenty-three thousand

Five hundred

eighty

20

How about 23 580 ? Try to put them together.

Our number is: Twenty-three thousand, five hundred and eighty

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

2

3

5

8

0

Twenty-three thousand

Twenty-three thousand

Five hundred

eighty

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Can you try:

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

2

5

1

8

5

6

3

6

0

5

0

2

9

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Did you get…

Two hundred and fifty-one thousand, eight hundred and fifty-six and Three million, six hundred and five thousand and twenty-nine?

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

2

5

1

8

5

6

3

6

0

5

0

2

9

23

Can you try…? 1 058 12 869 3 010 89 456 725 369 1 256 170

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Remember when we said… “Numbers can be written in 2 ways – FIGURES or WORDS.”

You can now convert FIGURES into WORDS. We are now going to look at converting WORDS to FIGURES.

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A common test question starts with: “Write in figures…” and then your teacher reads out a number in WORDS. Here you have to convert WORDS into FIGURES.

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How could we convert seventeen thousand and three?

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

27

How could we convert seventeen thousand and three? Seventeen uses 2 boxes as it is 17. Seventeen thousand will also use 2 boxes, only further to the left!

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

Seventeen thousand

Seventeen thousand

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How could we convert seventeen thousand and three? Fill in the rest of the numbers.

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

Seventeen thousand

Seventeen thousand

three

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How could we convert seventeen thousand and three? Try to convert any remaining boxes.

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

Seventeen thousand

Seventeen thousand

three

1

7

3

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How could we convert seventeen thousand and three? Fill in the empty boxes with a 0. Remember, we don’t need anything in the first 2 boxes.

Million

Hundred

Ten

(Unit)

Hundred

Ten

Unit

Thousand

Thousand

Thousand

Seventeen thousand

Seventeen thousand

three

1

7

0

0

3

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How could we convert seventeen thousand and three? So our number is 17003 We put a space every 3 digits from the right, starting with the decimal point if there is one. 17 003 or 17,003 (remember, some people put a comma instead!)

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