math
posted by stephanie .
use propertise and mental math to find
the value.
19+(28+21)
3 times 270
(86+27)+3

math 
katie
68
810
116
Respond to this Question
Similar Questions

Math
I need help with this problem. The question is : Find the exact value of the following expression. 6*22*5. Use any mental calculation technique you choose. Name the technique you use in each case. Here is what I have: 60*(20+2)*5 but … 
math
use properties and mental math to find the value. (10times8)times3 8times(3times5) (36+42)+24 
math
use mental math to find each value 5% rebate on a $150 cell phones 
math
use mental math to find each value cost of 8 items at $12.98 each 
math mental math help
i need to use mental math and the distributive property to simplify: can you pls check if this correct? 
math help
i need to use mental math and the distributive property to simplify: can you pls check if this correct? 
properties and mental math
use properties and mental math to find the value of (86 + 27) + 3 
Math
Use a double or half angle identity to find the exact value of the following expression: if cos x= 4/5 and 270° < x < 360°, find sin 2x Please help! Thanks 
math mental math
shelley spent 17 min washing the dishes. she spent 38 min cleaning her room. explain how you can use mental math to find how long shelley spent on the two tasks? 
math
On Saturday, the fruit and juice bar was selling 30 glasses of fruit punch an hour. By 7 p.m., they had sold 270 glasses. If their goal was to sell at least 360 glasses of fruit punch, which inequality can be used to find h, the number …