Maths brainteaser.

 Posts: 44
 Joined: Sun Oct 25, 2015 9:55 pm
Re: Maths brainteaser.
I never learnt that, so it's something important to remember.
Does X take precedence over / and + over  too, Brian1945, meaning we multiply first, then divide, add and subtract in that order?
Things could get very confusing if there were several different X / +  in the same operation and in jumbled order. Personally, I prefer the brackets system which makes it clearer and easier to calculate.
Does X take precedence over / and + over  too, Brian1945, meaning we multiply first, then divide, add and subtract in that order?
Things could get very confusing if there were several different X / +  in the same operation and in jumbled order. Personally, I prefer the brackets system which makes it clearer and easier to calculate.
Re: Maths brainteaser.
From that same wikipedia article (http://en.wikipedia.org/wiki/Order_of_operations)Silentecho wrote:I never learnt that, so it's something important to remember.
Does X take precedence over / and + over  too, Brian1945, meaning we multiply first, then divide, add and subtract in that order?
Things could get very confusing if there were several different X / +  in the same operation and in jumbled order. Personally, I prefer the brackets system which makes it clearer and easier to calculate.
The standard order of operations
The order of operations, or precedence, used in mathematics and many programming languages is expressed here:[citation needed]
terms inside parentheses or brackets exponents and roots multiplication and division As they appear left to right addition and subtraction As they appear left to right
This means that if a mathematical expression is preceded by one operator and followed by another, the operator higher on the list should be applied first. The commutative and associative laws of addition and multiplication allow terms to be added in any order and factors to be multiplied in any order, but mixed operations must obey the standard order of operations.
It is helpful to treat division as multiplication by the reciprocal (multiplicative inverse) and subtraction as addition of the opposite (additive inverse).

 Posts: 44
 Joined: Sun Oct 25, 2015 9:55 pm
Re: Maths brainteaser.
Thanks, panama, that's made things much clearer.panama wrote:It is helpful to treat division as multiplication by the reciprocal (multiplicative inverse) and subtraction as addition of the opposite (additive inverse).
 bindeweede
 Site Admin
 Posts: 3370
 Joined: Sun Oct 25, 2015 3:45 pm
 Location: Hertfordshire, UK
Re: Maths brainteaser.
Here's another  quite easy.
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...
What about this?
By moving one of the following digits, make the equation correct. 62  63 = 1
And another.
What is special about the following sequence of numbers?
8 5 4 9 1 7 6 10 3 2 0
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...
What about this?
By moving one of the following digits, make the equation correct. 62  63 = 1
And another.
What is special about the following sequence of numbers?
8 5 4 9 1 7 6 10 3 2 0
Re: Maths brainteaser.
Move one of the  between 63 and 1 to the left to make 62=631bindeweede wrote:
What about this?
By moving one of the following digits, make the equation correct. 62  63 = 1
 bindeweede
 Site Admin
 Posts: 3370
 Joined: Sun Oct 25, 2015 3:45 pm
 Location: Hertfordshire, UK
Re: Maths brainteaser.
No. You can only move the digits.panama wrote:Move one of the  between 63 and 1 to the left to make 62=631bindeweede wrote:
What about this?
By moving one of the following digits, make the equation correct. 62  63 = 1
 bindeweede
 Site Admin
 Posts: 3370
 Joined: Sun Oct 25, 2015 3:45 pm
 Location: Hertfordshire, UK
Re: Maths brainteaser.
Nobody else giving it a try?
Here's another.
If:
2 3 = 10
7 2 = 63
6 5 = 66
8 4 = 96
9 7 = ??
Here's another.
If:
2 3 = 10
7 2 = 63
6 5 = 66
8 4 = 96
9 7 = ??
 bindeweede
 Site Admin
 Posts: 3370
 Joined: Sun Oct 25, 2015 3:45 pm
 Location: Hertfordshire, UK
Re: Maths brainteaser.
Correct Brian. Any ideas on the others?
Re: Maths brainteaser.
Sorry, thought I answered this ages ago.By moving one of the following digits, make the equation correct. 62  63 = 1
26  63 = 1
Don't blame me  I voted remain
 bindeweede
 Site Admin
 Posts: 3370
 Joined: Sun Oct 25, 2015 3:45 pm
 Location: Hertfordshire, UK
Re: Maths brainteaser.
Correct. What about this?chaggle wrote:Sorry, thought I answered this ages ago.By moving one of the following digits, make the equation correct. 62  63 = 1
26  63 = 1
What do the following numerals represent?
11111121113122223222
ETA. That one isn't too hard, but this one got me.
Here is a series of numbers. What is the next number in the sequence?
1
11
21
1211
111221
312211
13112221
??
 bindeweede
 Site Admin
 Posts: 3370
 Joined: Sun Oct 25, 2015 3:45 pm
 Location: Hertfordshire, UK
Re: Maths brainteaser.
No takers then. I think this is called a "bump".
What about this?
What do the following numerals represent?
11111121113122223222
ETA. That one isn't too hard, but this one got me.
Here is a series of numbers. What is the next number in the sequence?
1
11
21
1211
111221
312211
13112221
??[/quote]
What about this?
What do the following numerals represent?
11111121113122223222
ETA. That one isn't too hard, but this one got me.
Here is a series of numbers. What is the next number in the sequence?
1
11
21
1211
111221
312211
13112221
??[/quote]

 Posts: 44
 Joined: Sun Oct 25, 2015 9:55 pm
Re: Maths brainteaser.
[quote="bindeweede"]Here's another  quite easy.
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...
55
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...
55
 bindeweede
 Site Admin
 Posts: 3370
 Joined: Sun Oct 25, 2015 3:45 pm
 Location: Hertfordshire, UK
Re: Maths brainteaser.
Yes. Have you tried the other one, Silentecho?Silentecho wrote:bindeweede wrote:Here's another  quite easy.
0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...
55

 Posts: 44
 Joined: Sun Oct 25, 2015 9:55 pm
Re: Maths brainteaser.
You mean this one?bindeweede wrote:Have you tried the other one, Silentecho?
Don't see the answer, no, or to your series of ones, twos and threes.bindeweede wrote:What is special about the following sequence of numbers?
8 5 4 9 1 7 6 10 3 2 0