Show how to use black and red chips to carry out the following operation 7 − ( − 2 ) =and determine the answer.

Question

Show how to use black and red chips to carry out the following operation  7  −  (  −  2  )  =and determine the answer.

Damarion Pierce · Accepted Answer

Step 1On magnifying the view, I could see that -2 is to be subtracted from 7.So, we go as under :+ ve quantity to be represented by black chip and - quantity by red chips.So, 7 will be represented by 7 black chips and -2 by 2 red chips.Now we have to subtract 2 red chips from 7 black chips.Subtracting a red chip will mean adding a black chip.Hence, we will add 2 black chips to 7 black chips.On counting, there will be 9 black chips.This means answer is 9.So,   7  −  (  −  2  )  =  9

Paxton Hoffman · Accepted Answer

Step 1Red and black chips are often used to model addition and subtraction of integers. A red chip represents -1 and a black chip represents +1.A red chip and a black chip &quot;cancel&quot; each other . So 2 red chip and a black chip &quot;cancel&quot; each other. And 5 black chips are left. So answer   =  +  5

Show how to use black and red chips to carry out the following operation 7-(-2)= and determine the answer.

Answered question

Answer & Explanation

New Questions in Pre-Algebra