Transcript Now try these…

Answer these quick fire
questions on your mini
whiteboards.
Multiply any integer by 10,
100 and 1000.
It looks like we add a zero,
but really all the numbers
move one place along the grid
to the left.
Use a place value grid to
help you…
Thousands Hundreds
TH
h
Tens
t
Units
u
Now multiply by 100….
Now multiply by 1000…
How many months are there
in a century?
How many months in a
millennium?
How many weeks in a
century?
A car costs 47p per mile to
drive, How much does it cost
to drive 100 miles? 1000
miles?
2000 miles?
A tourist stayed for 15 days in
Mali. He stayed ten times
longer than this in Angola.
For how many days did he
stay in Angola?
The country of Sierra Leone
extends for approximately
334km from East to West.
Algeria extends about ten
times further. Approximately
how far is Algeria from East
to West?
Group 3: Nh7 Pg 8
Group 2: Nh7 pg 7
Group 1: Nh6 pg 4
One hundred multiplied by
7170 is the same as 71700
Ten lots of fifty pounds and
five pence is 55 pounds.
Ten pounds and ten pence
multiplied by ten is one
hundred and ten pounds.
Answer these quick fire
questions on your mini
whiteboards.
Multiply decimals by 10,
100, 1000.
Sam has saved £3.46; a rich
uncle says he will multiply his
savings by 100! How can you
work out the answer?
Use a place value grid to
help you…
TH
Tenths =
h
1/10
Tths
10ths
t
Hundreths=
u
10ths 100ths
1/100
Hths
100ths
The decimal point does not
move!
Deanna spent 50p a day
on sweets. How much money
did she spend in 10 days? 100
days? 1000 days?
Can you convert from pounds
to pence?
Jack weighed 30kg. The
giant was 100 times heavier
than Jack. How much did the
giant weigh?
Can you tell me how much
the giant weighed in g?
The baby elephant’s trunk
was 10 times longer than
Bronagh’s little finger. How
long was the elephant’s trunk?
Now multiply by 100….
Now multiply by 1000…
Group 3: Abacus Challenge Page
3
Group 2: Nh7 pg 35
Group 1: Abacus pg - Questions
1 -11 Page 6
Draw a 2 x 2 grid.
Write in numbers between
10 to 50 – whole numbers
only!
Let’s play bingo.
Know addition pairs that
total 100.
Divide integers by 10, 100,
1000.
4.5 divided by 10 and
dividing by ten again is the
same as 4.5 divided by 100.
Use a place value grid to
help you…
TH
Tenths =
h
1/10
Tths
10ths
t
Hundreths=
u
10ths 100ths
1/100
Hths
100ths
The decimal point does not
move!
Now divide by 100….
Now divide by 1000…
Jo’s shelf is 126cm long.
She wants to put 10 boxes on
this shelf. How much space
will she have for each box?
Henri has scored 5923 runs in
cricket over 100 matches.
How many runs has he scored
on average in each match?
The female giraffe ate 965
leaves and the male elephant
ate ten times less. How many
leaves did the male giraffe eat?
The population of The
Gambia in Africa is
approximately 1.7 million
people. About ten times
fewer people live in Cheshunt
in the UK? Estimate how
many people live in Cheshunt
Group 3: Abacus Challenge Page
5
Group 2: Nh7 pg 9
Group 1L Abacus pg 7
How many times must one
hundred million be divided by
10 to get the answer of one?
Multiply and divide
decimals by 10, 100, 1000.
Multiply using the grid
method including
decimals.
89 x 123
X
100
20
3
80
9
First
partition
each
number
like this.
X
80
9
100
8000
900
20
1600
180
240
27
3
Now times
where the
arrows meet
(where the
dots are).
X
80
100
20
3
9
8000
900
1600
180
240
27
=
=
=
Now total up
all the circled
numbers.
8900
1780
+
267
10947
4.3 x 6.2
X
6
0.2
4
0.3
First
partition
each
number
like this.
X
4
0.3
6
24
1.2
0.2
0.8
0.06
Now times
where the
arrows meet
(where the
dots are).
X
4
6
24
0.2
0.8
Now total up
all the circled
numbers.
0.3
=
=
0.06
=
25.8
1.8
0.86
+
Abacus 3