Math
posted by Janae .
Evaluate the expression using mental math. Justify each of your steps.
1) 4(19)(25)
2) 17+32+23

Math 
bobpursley
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
Thanks

Math 
bobpursley
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
32+16+8. Evalute the expression justify each of ur steps

Math 
Gloria
5ab
Respond to this Question
Similar Questions

Advanced Math I
If a * b = a  3b and a # b = 2a + 3b, evaluate the expression (4 * 3) # 5. If y # y = 2x + 3y and x * y = 5x + 4y, evaluate the expression 2 # (4 * 3). Please help! Try to explain how I should solve these  don't just give me the … 
calculus
Evaluate the limits without using a calculator. Justify all steps in the solutions. lim x>0 x^7cos(3/x) 
calculus
Evaluate the limits without using a calculator. Justify all steps in the solutions. lim x>0 x^7cos(3/x) 
math
What are the steps of the order of operations? 
algebra
Simplify each expression. Justify your steps using the Commutative, Associative and Distributive Properties when necessary 8k2 + 4k  3k2 + 3^2  k + 5 Please let me 
7th Grade Math
723(4^22^3)*3 Evaluate the expression. I don't know the steps to take so please include them in your answer, THANKS:) 
4th grade Math
What is an expression that can be used to find 4 x 275 using mental math and properties of numbers? 
Math
Write an numerical expression equivalent to (3) (3) (3) using exponents. Evaluate the expression above 
math
Place grouping symbols in this expression so that the value of the expression is 37.Then justify your answer by simplifying the expression. 8×56+12÷6 
Math
Translate the phrase into an algebraic expression. Five times k A 5k (my answer) B k + 5 C k divided by 5 D 5  k Evaluate the expression when a = 6 a24 A  30 (My answer) B  18 C 18 D 22 Evaluate the expression when s = 9 and t …