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# Calculations

Parents eve
by

## Mike Ross

on 11 October 2012

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#### Transcript of Calculations

Multiplication, Division CALCULATIONS The Language
of
Calculations Mental
Strategies INFORMAL
&
FORMAL Written
Methods The things that
will help! KEY
FACTS Add Subtract Multiply Divide Mathematics Juniors
October
2012 total AND Sum of INCREASE more than PLUS ADDITION together + Minus LESS THAN difference TAKE AWAY decrease reduce _ fewer x times lots of groups of product multiple multiplication _ division groups of will each get shared average out of quotient divided by use KNOWN facts to help Make jottings Do it in the order that works best for you INFORMAL FORMAL CALCULATIONS

Our aims for the children at St. Monica’s

To have a secure knowledge of number
facts and a good understanding of the
4 operations
To use this knowledge to carry out
calculations mentally
To know when mental methods are not
appropriate
To have an efficient, reliable, written
method of calculation for each operation Have a go at these word problems Your Turn! Mrs Tottle-Nugent will read out a Mental maths test. You get a limited time to respond and there's no going back!
Good Luck!! Your Turn! We will show you a selection of calculations
Try to use a different method for each one.
Try to use:
a number line
Partitioning
A grid
Chunking!
It's possible that the methods that you were taught or work best for you, are NOT THE SAME for your child. Your turn Times tables Number bonds Doubles Halves Divisibility rules Number lines
Partitioning
Grid method
Chunking
Use near and adjust Column Addition Column Subtration Column Multiplication Short Division 5x4=20
20-4=5
20-5=4
4+4+4+4+4=20
5+5+5+5=20
and using knowledge of place value
5x40=200
4x50=200
200-50=4
200-40=5
40x50= 2000
0.5x4=2
5x0.4=2
0.4x0.5=0.2
and so on..... If you know 4x5= 20 what else do you know? 2 - the last digit is 0,2,4,6 or 8
3- the sum of the digits is divisible by 3
4- the last 2 digits are divisible by 4
5 - the last digit is 5 or 0
6 - It is divisible by both 2 & 3
7 - Check a known near multiple of 7
8 - Half of it is divisible by 4 OR
the last 3 digits are divisible by 8
9 - the sum of the digits is divisible by 9
10 - the last digit is 0 Divisibility Rules Know corresponding facts
Full transcript