BODMAS question
Moderators: Section Moderators, Forum Moderators
-
- Posts: 484
- Joined: Thu Oct 18, 2012 10:41 am
BODMAS question
Hello all,
Please could someone help with the question below:
12 - 2 x 4 + 3
Answers are:
A: 7
B: -2
C: 43
D:70
E: 1
I made it 7 and DS made it 1 !
My reasoning: 12 - 8 + 3
Doing 12 + 3 first = 15
Then 15 - 8 = 7
DS said: 12 - 8 + 3
Doing the addition first
8 + 3 = 11
12 - 11 = 1
Thank you
Sleepyhead
Please could someone help with the question below:
12 - 2 x 4 + 3
Answers are:
A: 7
B: -2
C: 43
D:70
E: 1
I made it 7 and DS made it 1 !
My reasoning: 12 - 8 + 3
Doing 12 + 3 first = 15
Then 15 - 8 = 7
DS said: 12 - 8 + 3
Doing the addition first
8 + 3 = 11
12 - 11 = 1
Thank you
Sleepyhead
Re: BODMAS question
7 is correct.
Your DS should be doing -8+3 of he feels he needs to do the addition first before subtraction, however he doesn’t need to. BODMAS puts the D and M toegethr and the A and S Together.
Your DS should be doing -8+3 of he feels he needs to do the addition first before subtraction, however he doesn’t need to. BODMAS puts the D and M toegethr and the A and S Together.
Re: BODMAS question
yes: within D&M and within A&S it's from left to rightTinkers wrote:7 is correct.
BODMAS puts the D and M together and the A and S Together.
-
- Posts: 484
- Joined: Thu Oct 18, 2012 10:41 am
Re: BODMAS question
solimum wrote:yes: within D&M and within A&S it's from left to rightTinkers wrote:7 is correct.
BODMAS puts the D and M together and the A and S Together.
thank you - that helps
-
- Posts: 682
- Joined: Fri Mar 10, 2017 5:06 pm
Re: BODMAS question
Yes the correct answer is 7 as explained.
This question is a great example of the biggest pitfall of the BODMAS mnemonic which seems to imply that division comes before multiplication and addition comes before subtraction. As others have mentioned though this is incorrect. The only reason that its BODMAS rather than BODMSA, BOMDAS or BOMDSA is that the former trips off the tongue better!
Interesting article here that suggests that pupils would be better served by the acronym BOPS where the P stands for Products (* and /) and the S stands for Sums (+ and -). The downside is that Product and Sum are perhaps less familiar terms for younger children.
https://www.teachwire.net/news/why-its- ... bin-bodmas" onclick="window.open(this.href);return false;
This question is a great example of the biggest pitfall of the BODMAS mnemonic which seems to imply that division comes before multiplication and addition comes before subtraction. As others have mentioned though this is incorrect. The only reason that its BODMAS rather than BODMSA, BOMDAS or BOMDSA is that the former trips off the tongue better!
Interesting article here that suggests that pupils would be better served by the acronym BOPS where the P stands for Products (* and /) and the S stands for Sums (+ and -). The downside is that Product and Sum are perhaps less familiar terms for younger children.
https://www.teachwire.net/news/why-its- ... bin-bodmas" onclick="window.open(this.href);return false;
-
- Posts: 484
- Joined: Thu Oct 18, 2012 10:41 am
Re: BODMAS question
That's really interesting - thank you
Re: BODMAS question
I knew my instinct to despise BODMAS was well-founded - BOPS it is from now on....
Last edited by solimum on Thu May 21, 2020 3:53 pm, edited 1 time in total.
Re: BODMAS question
They should be familiar with that by year 6. Lots of maths vocabulary work from KS1 onwardsSurferfish wrote:Yes the correct answer is 7 as explained.
This question is a great example of the biggest pitfall of the BODMAS mnemonic which seems to imply that division comes before multiplication and addition comes before subtraction. As others have mentioned though this is incorrect. The only reason that its BODMAS rather than BODMSA, BOMDAS or BOMDSA is that the former trips off the tongue better!
Interesting article here that suggests that pupils would be better served by the acronym BOPS where the P stands for Products (* and /) and the S stands for Sums (+ and -). The downside is that Product and Sum are perhaps less familiar terms for younger children.
https://www.teachwire.net/news/why-its- ... bin-bodmas" onclick="window.open(this.href);return false;