Warm Up *have work from test moz on desk Practice – use expanded form and distributive property 17 * 3 9)23 * 6 Practice – use expanded form and distributive property 305 * 48 10) 235 * 24

Announcements Homework – Testmoz quiz (multiplying decimals – due Thursday) – Test Corrections – Percents Test (due Friday) – Weekly Math #17 (due Friday) Remind 101 – TO: – TEXT

Vocab Review In the equation 4 * 3 = 12, 12 is the _________. The _________ of 6 are 1,2,3, and 6. The numbers 18, 27, and 72 are _________ of 9. Word Bank: Summultiples Differencefactors Product Least Common Multiple QuotientGreatest Common Factor Numeratordenominator

Review 5.NBT.1 Practice 1.26 * 10 Which way does the decimal Practice 1.26 ÷ 10 point move? 1) * 10^5 (100000) 2) ÷ 10^3 (1000)

Review Remember Multiplication = 3 * 5 = * 0.17 = Remember decimals are like ___________ 3 * 0.32 Repeated addition fractions

STRETCH BREAK

Multiplying Decimals with Standard Algorithm Step 1 : – Estimate product Step 2 : – Stack numbers vertically and multiply (ignore decimals at first Step 3: – Insert decimal point into product by: A – Look back at factors B – Count total # of decimal places C – Move product’s decimal point LEFT total # of decimal places

Practice : 4.08 * – Estimate 2 – Put both numbers into fraction form Why move the decimal point? – Make both numbers into whole numbers 4.08 * 1.08 * Multiplying Decimals with Standard Algorithm

Practice Ben wants to buy a baseball cap that costs $ The state and sales tax is 8% or _____. How much will he pay in sales tax? – 1 : Estimate – 2 : Make both values fractions – 3 : multiply – 4: write as decimal

Rules about multiplying decimals 5 * 1.05 = _________ than 1 st # 5 * 0.05 = _________ than 1 st # 0.5 * 0.05 = _________ than _______

Warm Up *have work from test moz on desk Practice – use expanded form and distributive property 305 * 48 11) 66 * ) 304 *10

Announcements Homework – Testmoz quiz (multiplying decimals – due Thursday) – Test Corrections – Percents Test (due Monday) – Weekly Math #17 (due Monday) Remind 101 – TO: – TEXT

Real World with Multiplying Decimals Finding cost of groceries and fabric Area of geometric shapes Gas and electric bill ( $0.128 per Kwh)

STRETCH BREAK

Review 5.NBT.1 Practice 1.26 * 10 Which way does the decimal Practice 1.26 ÷ 10 point move? 1)74.1 * 10^4 (__________) 2)381.8 ÷ 10^5 (__________)

Review Remember Multiplication = Remember decimals are like ___________ Repeated addition fractions

Multiplying multi-digit decimals Four 6 th graders are working on a project. They are going to paint a large banner and need to protect the floor. They measured the floor, which is 3.05 meters by meters. How many square meters of plastic do they need to cover the entire floor? – 1 : Estimate – 2 : Fractions – What will denominator be? – 3 : Use standard algorithm – how many decimal places?

STRETCH BREAK

Multiplying Decimals with Standard Algorithm Step 1 : – Estimate product Step 2 : – Stack numbers vertically and multiply (ignore decimals at first Step 3: – Insert decimal point into product by: A – Look back at factors B – Count total # of decimal places C – Move product’s decimal point LEFT total # of decimal places

Practice 1)0.3 * 0.035) 3.04 * 0.6 2)1.4 * 0.216) 0.66 * )0.06 * 1.027) 0.2 * 0.94 * 1.3 4)12.6 * 2.18) 1.54 * 3.05 * 2.6

Practice 1)Madeline studies honeybees. Every week she weighs the same honeybee hive. The first week the hive weighs kilograms. Its weight increases about kilograms every week. At this rate, how many kilograms will it increase in 7.5 weeks? 2)Your fingernails grow at an average rate of 2.25 inches per year. If they grew at an average rate, you never cut them, and they did not break, how long would your fingernails be in 4.5 years?

Practice 3) The greatest skateboarding speed recorded is mph by Roger Hickey in If he could keep up that speed for 15 minutes, how far could he go? 4) By the age of 21, the best violinists and pianists will have practiced at least 10,000 hours. If you practice an instrument 45 minutes a day for days, the length of 1 year, how many hours will you have practiced?

Test Corrections Work on Test Corrections and/or Weekly Math #17