Maths brainteaser.

[Silentecho]

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.

[panama]

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.

From that same wikipedia article (http://en.wikipedia.org/wiki/Order_of_operations)

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).

[Silentecho]

It is helpful to treat division as multiplication by the reciprocal (multiplicative inverse) and subtraction as addition of the opposite (additive inverse).

Thanks, panama, that's made things much clearer.

[bindeweede]

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

[panama]

What about this?

By moving one of the following digits, make the equation correct. 62 - 63 = 1

Move one of the - between 63 and 1 to the left to make 62=63-1

[bindeweede]

What about this?

By moving one of the following digits, make the equation correct. 62 - 63 = 1

Move one of the - between 63 and 1 to the left to make 62=63-1

No. You can only move the digits.

[bindeweede]

Nobody else giving it a try?

Here's another.

If:
2 3 = 10
7 2 = 63
6 5 = 66
8 4 = 96
9 7 = ??

[Brian1945]

144

[bindeweede]

Correct Brian. Any ideas on the others?

[chaggle]

By moving one of the following digits, make the equation correct. 62 - 63 = 1

Sorry, thought I answered this ages ago.

26 - 63 = 1

[bindeweede]

By moving one of the following digits, make the equation correct. 62 - 63 = 1

Sorry, thought I answered this ages ago.

26 - 63 = 1

Correct. 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

??

[bindeweede]

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]

[Silentecho]

[quote="bindeweede"]Here's another - quite easy.

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...


55

[bindeweede]

Here's another - quite easy.

0, 1, 1, 2, 3, 5, 8, 13, 21, 34, ...


55

Yes. Have you tried the other one, Silentecho?

[Silentecho]

Have you tried the other one, Silentecho?

You mean this one?

What is special about the following sequence of numbers?
8 5 4 9 1 7 6 10 3 2 0

Don't see the answer, no, or to your series of ones, twos and threes.