7th Math Unit 2 Day 12 - 11/16

Reverse--Change the multiplication equation into a division equation (like in our notes).

-4\times8=-32

(When writing division you can copy and paste this symbol: ÷ or you can just use a slash /)

(Highlight the symbol, Ctrl+c is copy, then Ctrl+v is paste)

CFS:

#1: Accurately divides using sign rules

#2: Writes accurate division equation

Reverse, Part 2--Change the multiplication equation into a division equation (like in our notes).

-7\times(-12)=84

(When writing division you can copy and paste this symbol: ÷ or you can just use a slash /)

(Highlight the symbol, Ctrl+c is copy, then Ctrl+v is paste)

CFS:

#1: Accurately divides using sign rules

#2: Writes accurate division equation

72\div(-6)

CFS:

#1: Accurately divides using sign rules

-99\div(-9)

CFS:

#1: Accurately divides using sign rules

\frac{-60}{-5}

CFS:

#1: Accurately divides using sign rules

64÷(− 8) =

72÷(− 9) =

-99÷(− 9) =

− 100÷100 =

− 90÷10 =

0÷(− 4) =

SORT IT--Drag and drop the expressions on the left depending on whether they have a positive or negative answer.

Climate--With world temperatures steadily increasing, glaciers (large blocks of ice) in the sea are starting to melt, which affects sea levels and causes problems for island nations.

One large glacier lost a total of 225 millimeters over 15 years.

Write a division equation to show the average change in the glacier's height each year.

(Copy and paste division here: ÷ )

CFS:

#1: Accurately divides using sign rules

Fractions are also division. Simplify the following fractions.

A. 8/-12

Fractions are also division. Simplify the following fractions.

b. -16/32

Fractions are also division. Simplify the following fractions.

c. -18/-4

Fractions are also division. Simplify the following fractions.

d. -(10/3)

Answer the divison question below.

-72\div(-8)=

CFS:

#1: Accurately divides using sign rules

In Heartwood's 7th grade math class, the teacher is grading some quizzes. Two students gave different answers:

Student A wrote: \frac{1}{-2}

Student B wrote: \frac{-1}{2}

The teacher's key says the correct answer is supposed to be -0.5.

Explain which student or students are correct and why.

"Student ____ is correct because..."

"The sign of the quotient is (positive / negative) because..."

CFS:

#1: Accurately divides using sign rules

#2: Explains using mathematical evidence