Posted by **Janae** on Wednesday, October 13, 2010 at 2:20pm.

Evaluate the expression using mental math. Justify each of your steps.

1) 4(19)(-25)

2) 17+32+23

- Math -
**bobpursley**, Wednesday, October 13, 2010 at 2:46pm
Round: 4*20 is about 80, which multiplied by (20+5)=1600+400=2000 about, and it is negative.

That is mental math.

- Math -
**Janae**, Wednesday, October 13, 2010 at 2:54pm
Thanks

- Math -
**bobpursley**, Wednesday, October 13, 2010 at 2:56pm
and I just saw a shortcut.

take the 4 and 25 first, 100. then times 19, ....

The problem with mental math is we see things with differing mental processes and perspectives, at differing times.

- Math -
**Alecia**, Tuesday, September 18, 2012 at 6:55pm
32+16+8. Evalute the expression justify each of ur steps

- Math -
**Gloria**, Tuesday, October 18, 2016 at 7:53pm
5ab

## Answer This Question

## Related Questions

- calculus - Evaluate the limits without using a calculator. Justify all steps in...
- calculus - Evaluate the limits without using a calculator. Justify all steps in ...
- algebra - Simplify each expression. Justify your steps using the Commutative, ...
- 4th grade Math - What is an expression that can be used to find 4 x 275 using ...
- Math - Write an numerical expression equivalent to (3) (3) (3) using exponents. ...
- math - What are the steps of the order of operations? Why is it important that ...
- 7th Grade Math - 72-3(4^2-2^3)*3 Evaluate the expression. I dont know the steps ...
- Advanced Math I - If a * b = a - 3b and a # b = 2a + 3b, evaluate the expression...
- math 115 - 1. divide 36/-4= 9 is this correct? 2. evaluate the expression |-5 +3...
- math - There are five questions on the section. These questions are for you to ...

More Related Questions