# Y1 S4 lesson on numbers year 1

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Slide 1: Video
EngelsMiddelbare schoolhavoLeerjaar 1

This lesson contains 14 slides, with interactive quizzes, text slides and 1 video.

## Items in this lesson

Numbers

#### Slide 2 -Slide

where do you use numbers?

#### Slide 3 -Mind map

there are two kinds of numbers. Do you know which two kinds?
A
ordinary and extraordinary numbers
B
cardinal and ordinal numbers
C
plain and special numbers
D
there are no two kinds of numbers, Jeroen! What were you thinking?!

#### Slide 4 -Quiz

So we have cardinals and ordinals.

we use cardinals for counting
one, two, three, four...

#### Slide 5 -Slide

So we have cardinals and ordinals.

we use ordinals when we want to give order to things.
first, second, third, fourth...

#### Slide 6 -Slide

cardinals
ordinals
Twenty-first century
he came in second place
The simpsons are on channel nine
world war two lasted more then five years
The steamengine was invented in the nineteenth century
most of you are twelve years old
The first world war lasted from nineteenfourteen to nineteeneighteen

#### Slide 7 -Drag question

important!
to make an ordinal number out of a cardinal there are some rules you simply need to learn:
1: one turns into first (or 1st).
2: two turns into second (or 2nd).
3: three turns into third (or 3rd)
from here it gets easier.
4: four turns into fourth (or 4th)

#### Slide 8 -Slide

A few things that you must remember!

You need to use a hyphen between the decimal and the numeral as soon as you pass twenty.

for cardinals:
so 21 is written as twenty-one, 22 is written as twenty-two etc.
for ordinals:
21st is written as twenty-first, 22nd is written as twenty-second, 23rd is written as twenty-third etc.

#### Slide 9 -Slide

one more thing...
when you come to the hundreds or even thousands you spell them as if you count the hundreds/thousands/millions.
Like so:
(one) hundred, two hundred, five thousand, ten million etc.
(note that there's no hyphen!)

#### Slide 10 -Slide

What number is spelled correctly?
A
My father is fifty-five years old.
B
Mum celebrated her fiftysecond birthday.
C
Her brother got his seventh birthdaycard.
D
Grandma has eightytwo candles on her birthdaycake

#### Slide 11 -Quiz

when do you need to use a hyphen (een streepje) between numbers
A
Between the first and the second letter.
B
Above twenty, between the decimal and the numeral.
C
Only with ordinal numbers
D
When cardinals are spelled wrong.

#### Slide 12 -Quiz

How old is Jeroen?
A
He is forty one years old.
B
He is forty-two but he feels as if he were twenty-seven.
C
He pretends to be young but is really, really old.
D
He is only thirtynine years old.

Questions?