# Bodmass and rules for number operations and brackets

Discussion in 'Primary' started by skills324, Nov 5, 2011.

1. 6-5+1
Do you do the addition first (as bodmass states) or are they equal so you do it left to right? 6-6=0,
So 6-5=1 + 1= 2
Or would this calculation 6-5+1 simply have two different answers depending on where you put the brackets. For example you would say to the children put in the brackets to make this correct;
6-5+1=0
6-5+1=2
and the children would put in the brackets to make the calculations correct.

2. 6-5+1
Do you do the addition first (as bodmass states) or are they equal so you do it left to right? 6-6=0,
So 6-5=1 + 1= 2
Or would this calculation 6-5+1 simply have two different answers depending on where you put the brackets. For example you would say to the children put in the brackets to make this correct;
6-5+1=0
6-5+1=2
and the children would put in the brackets to make the calculations correct.

3. Brckets, indices first , then multiplication, division, then addition and subtraction from left to right as they appear.
SO 6-5+1=2
and (6-5)+1+2
but 6-(5+1)=0

4. Spooky! I asked this same question a while ago after having a sudden tizz!
5 x 4 + 2 - 1 = 21
16 divided by 2 x 5 - 3 + 4 = 41
Which is the same as 16 * 5 divided by 2 + 4 - 3= 41 (because multiplication and division have equal precedence) followed by addition and subtraction.

5. Not a maths specialist, bu I do wonder if you're over-complicating matters for Primaries with Bodmas (one S).
In the example you give 6 - 5 = 1 there's no problem as brackets aren't inolved and you just do the calculation in the order written- left to right i. e. 6 minus 5 plus 1 giving an answer of 1 (1 + 1).
For me BODMAS only really comes into it's own when deaking with complicated calculations involving one or more brackets such as ( 2 + 6) - (4 - 1), when one has to consider which pairs to match with which operation.