Addition, Subtraction,

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

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# Calculations

Parents eve