Transcript Y5T1U2D3 - Primary Resources

L.O.1
To be able to find fractions of numbers and
quantities
We are going to play
“Four in a row”
Listen carefully to the instructions.
.
L.O.2
To be able to use informal pencil and paper
methods to support, record or explain divisions;
to extend written methods to HTU÷U;
to choose and use appropriate ways of
calculating mental, mental with jottings, written
methods.
.
Q. A school has 392 chairs.
How many tables can be equipped with 4 chairs each?
Q. How could we work this out?
Our sum will be
392 ÷ 4
Q. Approximately how many tables can be equipped?
392 ÷ 4
We know that
90 x 4 = 360
and 100 x 4 = 400
so our answer will be between 90 and 100.
Work in pairs to solve this problem on your whiteboards.
There should be 98 tables with four
chairs around each!
How did you do it?
You have a copy of
Activity Sheet 3.1
You should choose
an appropriate method
for the calculations
(mental, jottings or
written) but not use
calculators. Record
your calculations on
the sheet.
Q. Which shapes have left us with spare chairs?
392 is exactly divisible by 4, 8, and 7 – no spare chairs but has a remainder when divided by 5, 6 and 9 – spares!
Q. How do we know when a number is divisible by 2?
Q. What does divisible mean?
To be divisible by 2 the last digit must be
AN EVEN NUMBER.
Q. How do we know when a number has 4 as a factor
i.e. is divisible by 4?
Which of these have 4 as a factor?
222
168
267
145
444
232
783
312
124
516
These have 4 as a factor because
the LAST
2 DIGITS are divisible by 4.
232
168
124
444
312
516
32
68
24
44
12
16
Q. How do we know when a number can be
divided by 5 without a remainder
i.e. has 5 as a factor?
Write some numbers which do and some which
do not have 5 as a factor.
Use columns.
By the end of the lesson the children
should be able to :
Discuss, explain and compare methods;
use multiples of the divisor;
solve problems involving HTU ÷ U calculations