Mammoth Memory

What is BIDMAS?

You can't do sums in any order you have to follow the BIDMAS the order for completing sums

Bidmas is the memory aid used to work out which order mathematical calculations should be completed in:

BIDMAS the order for completing sums Brackets indices division multiplication addition subtraction

The above is the order you complete any calculation.

Brackets   - (           )
Indices  - To the power e.g. 
    `3^3=3times3times3` or `sqrt9=9^(1/2)=3`
Division - Divide
Multiplication - Multiply
Addition     - Add
Subtraction   - Take away  

                                                         

Example 1

`30-:-5+4times-2+14`

Stage 1    - Division  `30-:-5` `=` `-6` Therefore `-6+4times-2+14`
Stage 2  - Multiplication `4times-2` `=` `-8` Therefore `-6-8+14`
Stage 3   - Addition  `8+14` `=` `-6` Therefore `-6+6`
Final stage  - Subtraction `-6+6` `=` `0`    

 

 

Example 2

`(4times5)^2+2times2^2`

Stage 1    - Brackets `4times5` `=` `20` Therefore `20^2+2times2^2`
Stage 2  - Indices `20^2=400` and `2^2=4` Therefore `400+2times4`
Stage 3  - Multiplication  `2times4` `=` `8` Therefore `400+8`
Final stage - Addition      `400+8` `=` `408`    

 

 

Example 3

What is `x`?

`4times4+4times4+4-4times4=x`

Stage 1  - Multiplication  `4times4=16` and `-4times4=-16` Therefore `16+16+4-16`
Stage 2  - Addition  `16+16+4` `=` `36` Therefore `36-16`
Final stage - Subtraction `36-16` `=` `20` Therefore `x=20`

 

 

Example 4

`6-:2(1+2)`

Stage 1 - Brackets  `1+2` `=` `3` Therefore `6-:2times3`
Stage 2   - Division `6-:2` `=` `3` Therefore `3times3`
Final stage - Multiplication `3times3` `=` `9`    

 

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