# math

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use mental math and the distributive property to simplify 25(-99)and 19x21

• math -

Round the numbers so that they are easy to do you your head.

• math -

exsample for danny 25(-99) what is the answer thanks

• math -

What she is trying to say it, change the numbers into easier number that you can multipy in your head.

Change -99 to -100

Then the question would be 25(-100)
which is equal to -2500

but you added on a -25
so now you you have to add on a positive 25;

-2500+25=-2475

That should be the right answer.

Try doing the other one on your own.

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