math mental math help

posted by .

i need to use mental math and the distributive property to simplify:
can you pls check if this correct?
a) 19(-6) i got: -114
or do i do like this:
10*(-6)=-60
9*(-6) =-54
-60 + -54= -114

b) 102* $21 i got: $2142
or do i do mental math like this:
100*21 = 2100
2 * 21 = 42
2100 + 42 = $2142


c) 26*97 i got: 2522
or do i do mental math like this:
20 * 97 = 1940
6* 97 = 582
1940 + 582 = 2522

d) 9 * $4.98 i got: $44.82
or do i do mental math like this:

9 * $4.00 = $36.00
9*.98 = 8.82
36.00 + 8.82 = $44.82

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Distributive property

    How would I multiply these expression? 6(h-4) -3(x+8) -10(-a+5) PLease and thank-You Multiply the coefficient (outside the parentheses) by each term inside the parentheses. For example, 6(h-4) = 6h - 24 You do the others do you have
  2. math

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

    okay so i feel like a dummie for not knowing this but i need the answer FAST! Which property would allow you to use mental computation to simplify the problem 27 + 15 + 3 + 5?
  4. algebra mental math distributive property

    find each product mentally using the distributive property i know for 4 (10.2) i do this = 4 (10 + 2) = 4 (10) + 4 (2) = 40. + .8 = 40.8 but I am not sure how to show work on on following 2 problems: 11.6 (9) and 3.4 (5)
  5. math

    find the product using mental math and the distributive property for 7(15) showing the work as shown
  6. math help

    i need to use mental math and the distributive property to simplify: can you pls check if this correct?
  7. math

    Which property would allow you to use mental computation to simplify the problem 27 + 15 + 3 + 5?
  8. ^th grade math,

    using mental math and distributive property solve: 25(12)
  9. math

    Write an algebraic expression that requires each of the following properties of real numbers to simplify, in the order given: the Distributive Property, the Associative Property of Addition, the Commutative Property of Addition, and …
  10. Algebra

    Explain how to use mental math to simplify the expression. a.) 8 * 3 * 2 b.) 8 * 2 + 3 c.) 5 + 8 + 3 d.) 10 * 3 -4 I have to include what properties (associative, distributive etc.) I used to simplify the problems.

More Similar Questions