Rounding Whole # & Decimals
What is 3.962 rounded to the nearest hundreth?
3.96
The library has a study room that is 13.67 square meters on the first floor and a closet that is 9.52 square meters on the second floor. Which of the following is the best estimate of the total number of square meters of the two rooms?
24
Felipe needs to run two miles for soccer team tryouts. He ran his first mile in 11.56 minutes. He ran his second mile in 11.12 minutes. What is the combined time for the two miles.
22.68
Manny has a ranch that is 15.47 acres. Jason has a ranch that is 12.55 acres. How many more acres is Manny's ranch than Jason's?
2.92
Mental Math: Erin worked 25.75 hours last week. She worked 17.25 this week. How many total hours did she work these two weeks?
43
Tammy has a rope that is 17.549m long. What is 17.549 rounded to the nearest hundreth?
17.55
Which two runner's distances are less than 6 miles?
Tom 3.5
Jan 3.95
Pete 2.25
Maria 4.55
Tom & Pete
Erin has $53.96. Her friend Carole owes her 8.34. How much money will Erin have when Carole repays her?
62.30
Tamera buys a shirt for $14.69 and a pair of pants for $21.32. How much more does she spend for the pants?
$6.65
Draw a picture that represents the problem:
The student gov't ordered 10.5m of ribbon in colors red, blue and purple. If 3.8m are blue and 4.2m are purple, how many meters are red?
(*Teacher-- Check problem #6 answer A)
Estimate: 9.45 + 20.51 + 30.05 + 3.01 by rounding to the nearest whole number. What numbers did you add?
63: 9, 21, 30, 3
Use Mental math to solve. Carol has $11.20 in one piggy bank and $23.80 in another piggy bank. How much money does she have in all?
$35
Reilly adds 45.3 and 3.21. Should his sum be greater than or less than 48? Explain
The sum should be greater than 48, because the whole numbers have a sum of 48 without adding the decimals.
The Ming family spent $15 on lunch and $7 on dessert. What is a way to find out how much change they would get from $30?
Use mental math to solve:
A school cafeteria has one window that is 2.09m wide. It has another window that is 3.21m wide. What is the total width of the two windows?
5.3
At the store, Nela bough a rose for $4.59, a carnation got $5.39, and a tulip for $3.79. Round to the nearest dollar to determine about how much Nela spent. Write an equation to show your work.
About 14.
5+5+4
Estimate to determine if the difference of 6.2-4.96 is less than or greater than 1.
Greater than 1; 4.96 is about 5, so the difference is about 1.2
Maria spent $7.99 on a book and $12.75 on art supplies. How much did she spent on the book and art supplies all together?
$20.74
Miami's annual precipitation in 2000 was 61.05 in. Albany's was 46.92 in. How much greater was Miami's precipitation than Albany's?
14.13 in
Tom's family is driving 50 miles to visit a museum. After driving 36 miles, they stop to have lunch. Draw a picture and write an equation to determine how much farther Tom's family has to drive before they reach the museum.
(*Teacher check #16) 50-36 = 14
Round the population of North Las Vegas to the nearest ten thousand:
176, 635
180,000
Which numbers should you add to estimate the answer to this problem:
87,087 + 98,000
87,000 + 98, 000
Peter's vegetable garden is rectangular it is 7.75 ft long and 3.65 ft wide. He wants to put a fence around the edge of the garden to keep animals from eating his vegetables. How many feet of fence does he need?
7.75 + 7. 75 + 3.65 + 3.65 = 22.8 ft
Izak had $132.82 in his bank account. He withdrew $12.75 on Monday and $38.50 on Friday. How much money does he have left in his bank account? He must keep at least $100 in his account or he will be charged a fee. How much does he need to deposit to avoid being charged a fee?
12.75 + 38.50 = 51.25 he withdrew.
132.82- 51.25 = 81.57 left in his account
100.00-81.57 = 18.43 he needs to deposit in order to not get charged a fee
To add 40 + 70 + 20, Crystal first added 70 + 20. Which property did Crystal use to add mentally?
Associative property of addition
Commutative Property of Addition
Distributive Property
Identity Property of addition
Associative property of addition