Math

posted by .

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

1) 4(19)(-25)



2) 17+32+23

  • Math -

    Round: 4*20 is about 80, which multiplied by (20+5)=1600+400=2000 about, and it is negative.

    That is mental math.

  • Math -

    Thanks

  • Math -

    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 -

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

  • Math -

    5ab

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. 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 …
  2. calculus

    Evaluate the limits without using a calculator. Justify all steps in the solutions. lim x-->0 x^7cos(3/x)
  3. calculus

    Evaluate the limits without using a calculator. Justify all steps in the solutions. lim x-->0 x^7cos(3/x)
  4. math

    What are the steps of the order of operations?
  5. 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
  6. 7th Grade Math

    72-3(4^2-2^3)*3 Evaluate the expression. I don't know the steps to take so please include them in your answer, THANKS:)
  7. 4th grade Math

    What is an expression that can be used to find 4 x 275 using mental math and properties of numbers?
  8. Math

    Write an numerical expression equivalent to (3) (3) (3) using exponents. Evaluate the expression above
  9. math

    Place grouping symbols in this expression so that the value of the expression is 37.Then justify your answer by simplifying the expression. 8×5-6+12÷6
  10. 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 a-24 A - 30 (My answer) B - 18 C 18 D 22 Evaluate the expression when s = 9 and t …

More Similar Questions