Estimating Sums and Differences
Add/Subtract
Whole Numbers and Decimals
Estimate or Exact Answer
Addition Properties
Place Value vs. Place
100
Bethany made purchases of $10.34 and $27.60 at the store. Estimate what she spent to the nearest dollar.
$38.00
100
5.498 + 0.03 = ?
5.528
100
A group goes rafting on the Mississippi River. Each raft carries 12 people. If there are 8 rafts, how many people can go rafting?
Exact Answer ~ 96 people
100
Identify the Addition Property used to rewrite the problem 16 + 29 + 4 = 16 + 4 +29
Commutative Property
100
Name the place value of where the 3 is located 10,148.637
hundredths
200
Estimate: 936 + 792 + 117 = ?
2,200
200
32.4 + 45.17 + 13.068 = ?
90.638
200
A family is renting a cabin for $59.95 for 5 days. About how much will they pay for the cabin?
Estimate Answer ~ $300
200
Identify the Addition Property used to rewrite the problem (12 + 16) + 34 = 12 + (16 + 34)
Associative Property
200
Which number is in the tens place? 169.853
6
300
Estimate: 30.51704 - 6.889
24
300
Jan's lunch bill is $5.74. She pays with a $10 bill. How much change does she receive?
$4.26
300
School raffle tickets cost $3.00 each. The school's goal is to raise at least $400.00 from the raffle. If 138 tickets were sold, did the school meet its goal?
Estimate Answer ~ Yes ($414.00)
300
Identify the Addition Property used ro rewrite the problem 864.17 + 0 = 864.17
Identity Property
300
Add a number to make this sentence true... 26.4103 = 26.410_
3
400
In the first week of April, 383 people visited the museum. In the second week, 142 people visited the museum. 654 people visited the museum in the third week. What is the best estimate of the total number of people visiting the museum during these three weeks?
1,200 people
400
In 2006, LeBron James averaged 31.4 points per game. Dwyane Wade averaged 27.2 points. What was the difference in their averages?
4.2 points
400
Jimmy has 9 quarters, 7 dimes, and 5 nickels. Does he have enough money to buy a box of crayons that costs $3.25?
Exact Answer ~ No (short $0.05)
400
Identify the Addition Property used to rewrite the problem 88 + 16 + 23 = 16 + 88 + 23
Commutative Property
400
Round 14,625.871 to the nearest tenth.
14,625.9 or 14,625.900
500
Last year, the Clearwater CD Company had sales of $11,587,982. This year, the company had sales of $6,997,005. What is the best estimate of the company's total sales for both years?
$19,000,000
500
The snow in Gina's yard is 4.25 inches deep. If the depth of the snow increases by 1.25 inches every hour, how deep will the snow be after 3 hours?
8 inches
500
Ms. Diesterhaft wants to buy a new couch for the classroom that costs $960. So far, she has only collected $375 in donations. About how much more money does Ms. Diesterhaft need in order to get her new couch?
Estimate Answer ~ $600
500
Identify the Addition Property used to rewrite the problem (15 + 25) + 30 = 15 + (25 + 30)
Associative Property
500
Round to the nearest thousand 84,286.09
84,000.00
M
e
n
u