Multiplying Decimals Miss Caldwells Class 2019 2020 Exponents

Multiplying Decimals Miss Caldwell’s Class 2019 -2020

Exponents are REPEATED MULTIPLICATION!!!! Why do we use exponents? IT’S A SHORTCUT OR LOOOOOOOOOOOOOOOOOOOOOOOOONG NUMBER!!!! Exponents tell the amount of 0’s in you value!!! (1091 x 15) is the same as…. 1000000000000000000000000000000000 X 15

How do we multiply exponents and decimals? Multiplying Decimals and Exponents are REPEATED MULTIPLICATION!!!! Steps 1. If you are working with an EXPONENT, figure out the value first! 2. Put the decimals in standing form and find the secret number! Secret number = skip count until you get to the decimal and add the numbers together! (Count from the back! Right to left!) 3. 4. Multiply like normal – that means like the decimal ain’t there! (Just for a sec ; ) ) Put the decimal back in the total using the secret number!!! Exponents tell the amount of 0’s in you value!!! (1091 x 15) is the same as…. 1000000000000000000000000 X 15

Multiplying Decimals and Fractions Multiplying Fractions Why do we do it? -find area -find a piece of an amount -Compare different amounts -repeated addition What do they have in common? The same reasons why we multiply fractions are the same reasons why we multiply decimals! Fractions are decimals but written in different forms! Multiplying Decimals Why do we do it? -find area -repeated addition Compare different amounts -find a piece of an amount

X Decimals – Repeated Addition What is repeated addition? Repeated additions is when you have a number and you are adding it over and over… Example: Jenna get. 25 cents each week for allowance. She I saving for 4 weeks. How much money will she have in 4 weeks? 0. 25 x 4 0. 25 + 0. 25 = 1. 00

X Decimals – Finding Area What is AREA? Length x Width = Area The total space inside of a closed space Example: Lindsay Lohan is painting her bedroom door. The length 20. 3 feet and the width is 5. 3 feet. What is the area of the door?

X Decimals – Comparing Amounts to each other What do you mean “compare amounts”? Compare two numbers to see which one is bigger, smaller, or if they are the same! Example: Mr. Smith can walk 2. 3 miles while Mr. Di. Caprio can walk 4. 6 miles. How much more can Mr. Di. Caprio walk than Mr. Smith? Answer: He can walk twice as much (x 2) as Mr. Smith.

X Decimals – Finding a Piece of an Amount What do you mean, “find a piece of an amount”? You are trying to find a smaller piece of a BIGGER AMOUNT! Example: If there are 10 people sharing 1 pizza, how much of the pizza would each person get? (A smaller piece of a bigger amount of pizza…)

X Decimals – How to do it! Steps 1. If you are working with an EXPONENT, figure out the value first! 2. Put the decimals in standing form and find the secret number! Secret number = skip count until you get to the decimal and add the numbers together! (Count from the back! Right to left!) 3. Multiply like normal – that means like the decimal ain’t there! (Just for a sec ; ) ) 4. Put the decimal back in the total using the secret number!!!