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- #1

#### bergausstein

##### Active member

- Jul 30, 2013

- 191

a. 5+37

b. 6*17

c. 12*16

d. 64+55

i'm not quite sure where to start.

- Thread starter bergausstein
- Start date

- Thread starter
- #1

- Jul 30, 2013

- 191

a. 5+37

b. 6*17

c. 12*16

d. 64+55

i'm not quite sure where to start.

- Mar 10, 2012

- 835

Hey Bergausstein.

a. 5+37

b. 6*17

c. 12*16

d. 64+55

i'm not quite sure where to start.

I am not quite sure what you mean by 'breaking down the comoutation'. Can you give an example?

- Thread starter
- #3

- Jul 30, 2013

- 191

here's an example from my book.Hey Bergausstein.

I am not quite sure what you mean by 'breaking down the comoutation'. Can you give an example?

243 = 2*10*10+4*10+3

i don't know how to relate the properties of real numbers to this.

- Mar 10, 2012

- 835

For part a. I'd write:

a. 5+37

b. 6*17

c. 12*16

d. 64+55

i'm not quite sure where to start.

5+37 = 5+30+7 = 30+5+7 = 30+12 = 30+10+2 = 40+2 = 42.

Here we used associativity and commutativity of addition.

For part b.

6*17 = 6*(10+7) = 6*10+6*7 = 60+42 = 60+40+2 = 100+2 = 102.

Here we used associtivity of addition and distributivity of multiplication over addition.

I think this is what you are looking for. The rest are similar.