7th Grade MathWeek of 9/22/14

Information from : http://net.cmsdnet.net/schools/math/sld005.htm

http://www.mathsisfun.com/adding-decimals.html

Monday: Bell Work

1) –7.5t + 4 = -26

2) 22.1 = 4.2h + 3.1

* Solve the equations

2- Step Equation

... use patterns and properties to explore, develop properties and describe real-world situations represented by the multiplication or division of integers? (7.NS.2a)

Word Wall Quiz

Match and/or Fill in the blank for each term

Words are only used one time.

For the matching – write the letter beside the number

Fractions

Fraction is divided into 2 parts

Numerator

Denominator

The numerator (the part) is being compared to the denominator (the whole)

Comparing Fractions

Example: which is bigger: 3/8 or 5/12 ? Convert each fraction to a decimal.

We can use a calculator (3÷8 and 5÷12)

Anyway, these are the answers I get: 3/8 = 0.375, and 5/12 = 0.4166...

So 5/12 is bigger.

HW

Worksheet

Exit / Closure

• Why is important to change the numerator when you change the denominator?

Tuesday: Bell Work

1) a + 5.8 = 26.6 4.5

2) X + 2.4 = 15.4 2

Solve the equationsHave homework on desk ready to check

Lesson

• ... solve real-world problems involving the addition, subtraction, multiplication, and/or division of rational numbers? (7.NS.3)

Adding Fractions

Adding Fractions There are 3 Simple Steps to add

fractions:Step 1: Make sure the bottom numbers (the

denominators) are the same Step 2: Add the top numbers (the

numerators), put the answer over the denominator

Step 3: Simplify the fraction (if needed)

Subtracting Decimals

Follows the same pattern as adding except you subtract the numerators.

Exit / Closure

In math, why is it important to have the same denominator when adding and subtracting decimals?

Wednesday: Bell Work

Joey, Keith, and Eli have a combined height of 7 meters. If Joey is 2.31 meters tall and Eli is 2.6 meters tall, how tall is Keith?

*Write and solve the equation. The variable cannot be in the answer.*

Lesson

• ... solve real-world problems involving the addition, subtraction, multiplication, and/or division of rational numbers? (7.NS.3)

Adding / Subtracting Mixed Numbers

Subtracting Mixed Numbers

Exit / Closure

• What is the purpose of converting mixed numbers to improper fractions?

Thursday: Bell Work1) James works at an Indian sweet shop. He needs to fill boxes with 0.3 kilograms of coconut candy each. If he has 8 kilograms of coconut candy, how many boxes can he fill?

Write and solve the equation. The variable cannot be in the answer.*

Lesson

• ... solve real-world problems involving the addition, subtraction, multiplication, and/or division of rational numbers? (7.NS.3)

• N2K 3

Critical Thinking Activity

Dan worked as a volunteer for a total of 103 hours in 21 days. He worked about the same number of hours each day. Which is the best estimate of the number of hours Dan worked as a volunteer each day?

a) 3

b) 4

c) 5

d) 6

Constructed Response Amy is in charge or ordering new computers for

her classroom. If each computer costs $1256.33 and Amy needs to order 5 computers, about how much money will Amy need?

Amy says she will need about $5,000.00 for her new computers. She shows her work:

$1256.33 rounds to $1000.00 and 1000.00 times 5 = $5,000.00

Did Amy round correctly for this situation? Defend you answers using words and examples.

Exit / Closure

• What is the importance of checking your work in math?

• Discuss with a partner

Friday: Bell Work1) Maneesha purchased a box of pencils for

$1.28 and gave the cashier $10.00. How much change should she get back?2) If you buy an ebook for $29.62 and download 5 songs for $1.29 each, what is the total amount you have spent?*Write and solve a 2-step equation.

***notes for Agenda

Benchmark – Monday 9/29

Ch 3 Test – Friday 10/3

Lesson

• ... solve real-world problems involving the addition, subtraction, multiplication, and/or division of rational numbers? (7.NS.3)

Multiplying Fractions

N x N = N

D D D

6 X 8 = 48

7 11 77

Multiply straight across

Dividing Decimals

N ÷ N = N

D D D

*multiply the reciprocal

N x D = N

D N D

6 ÷ 8 = 48 6 x 11 = 66

7 11 77 7 8 56

Multiplying / Dividing Mixed Numbers

Change to mixed numbers to improper fractions and then multiply or divide.

Exit / Closure

• Tommy said that 4 + 2 x = -24 x is 14.

• Justify whether Tommy is incorrect or correct.

• ***Be ready to explain your answer to a partner.