1.13
DESCRIPTION
1.13. “I can estimate the results of computations involving whole numbers and decimals, using a variety of strategies.”. Why is this important?. How many people like to do things quickly? Plan for a party. How many people estimate when you shop to make sure you have enough money? - PowerPoint PPT PresentationTRANSCRIPT
1.131.13
“I can estimate the results of computations involving whole numbers and decimals, using a
variety of strategies.”
“I can estimate the results of computations involving whole numbers and decimals, using a
variety of strategies.”
Why is this important?Why is this important?
How many people like to do things quickly?
Plan for a party.How many people estimate when you shop to make sure you have enough money?
Estimating saves time.When are good times to estimate?
How many people like to do things quickly?
Plan for a party.How many people estimate when you shop to make sure you have enough money?
Estimating saves time.When are good times to estimate?
VocabularyVocabulary
Estimate - An estimate is close to the ________ answer. Estimating saves you ________ by making problems ________.
Strategies of Estimating: 1. Make it easier to work
with.2. Front End Estimation3. Rounding 4. Compatible Numbers
Estimate - An estimate is close to the ________ answer. Estimating saves you ________ by making problems ________.
Strategies of Estimating: 1. Make it easier to work
with.2. Front End Estimation3. Rounding 4. Compatible Numbers
What word is a clear indication that you are estimating?
What word is a clear indication that you are estimating?
ABOUTEstimate the following:12 $3421,953
12,994 $59.29 939
ABOUTEstimate the following:12 $3421,953
12,994 $59.29 939
Question?Question?
On Monday, Camille drove 74.9 miles from Union to Columbus. On Tuesday, she drove 142.82 miles from Columbus to Canton. About how many miles did Camille drive in all?
A. 225 miles B. 100 milesC. 175 miles D. 150 miles
On Monday, Camille drove 74.9 miles from Union to Columbus. On Tuesday, she drove 142.82 miles from Columbus to Canton. About how many miles did Camille drive in all?
A. 225 miles B. 100 milesC. 175 miles D. 150 miles
PracticePractice
Jon weighed 98 pounds. He gained 21 pounds during the last year. Estimate how many pounds he weighed a year ago.
A. About 80 poundsB. About 98 pounds
C. About 120 poundsD. About 77 pounds
Jon weighed 98 pounds. He gained 21 pounds during the last year. Estimate how many pounds he weighed a year ago.
A. About 80 poundsB. About 98 pounds
C. About 120 poundsD. About 77 pounds
PracticePractice
Willis has to distribute $2,008 of charity money raised by his classmates among 10 different charities. If he donates the same amount of money to each charity, which is a reasonable estimate of how much money each charity will receive?
A. $20B. $100C. $200D. $300
Willis has to distribute $2,008 of charity money raised by his classmates among 10 different charities. If he donates the same amount of money to each charity, which is a reasonable estimate of how much money each charity will receive?
A. $20B. $100C. $200D. $300
1.41.4
“I can round decimals to a given place value.”
“I can round decimals to a given place value.”
VocabularyVocabulary
Rounding - one way to find an approximate _________. Use place value to help you round.
Rounding is a strategy of __________.
Rounding - one way to find an approximate _________. Use place value to help you round.
Rounding is a strategy of __________.
Rule 1Rule 1
Underline the place value you are rounding to.
Round to the nearest tenths place.
459.46
Underline the place value you are rounding to.
Round to the nearest tenths place.
459.46
Rule 2Rule 2
Draw an arrow to the number to the _________.
If that digit is 4 or less, (Round Down) Keep the number the same.
If the digit is 5 or more, Round up.
Round to the nearest tenths place.
459.46
Draw an arrow to the number to the _________.
If that digit is 4 or less, (Round Down) Keep the number the same.
If the digit is 5 or more, Round up.
Round to the nearest tenths place.
459.46
Rule 3Rule 3
All the numbers to the left of the rounding number stay the ______.
All the numbers to the right of the rounding number become ________.
Round to the nearest tenths place.
459.46 459.50
All the numbers to the left of the rounding number stay the ______.
All the numbers to the right of the rounding number become ________.
Round to the nearest tenths place.
459.46 459.50
PracticePractice
Round the following decimal to the nearest hundredths.
321.876
A. 321.800 B. 321.880 C. 321.870
What is 6.74 rounded to the nearest tenths?
A. 6.70 B. 6.80 C. 6.75
Round the following decimal to the nearest hundredths.
321.876
A. 321.800 B. 321.880 C. 321.870
What is 6.74 rounded to the nearest tenths?
A. 6.70 B. 6.80 C. 6.75
PracticePractice
Round 89.155 to the nearest whole number.
A. 90 B. 89.155 C. 89.000
Round $34.81 to the nearest dollar.
A. $34 B. $35 C. $35.81
Round 89.155 to the nearest whole number.
A. 90 B. 89.155 C. 89.000
Round $34.81 to the nearest dollar.
A. $34 B. $35 C. $35.81
What did we learn today?
What did we learn today?
List:List: