0015 0016 Gr5 S C01L1HW 115024 - Weebly
Name
Number and Operations in Base Ten 5.NBT.4, 5.NBT.7
Lesson 2
Estimate Sums and Differences
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The results of a recent skateboard competition are shown. About how many more points did Steamer have than Dal Santo?
Round each decimal to the nearest ten. Then subtract.
Athlete Elissa Steamer Marisa Dal Santo Amy Caron
Points 87.83 81.50 80.00
Steamer Dal Santo
87.83 81.50
90
----8-0 10
So, Steamer scored about 10 more points than Dal Santo.
Practice
Round each decimal to the nearest one. Then add or subtract.
1. $3.85 ---$-2-.1-7
$2
2. 52.85 ----9-.0-9
44
3. 19.83 -+--9-.9-3
30
4. 3.872 + 2.409 = 6
5. 9.086 - 2.419 = 7
Copyright ? The McGraw-Hill Companies, Inc.
Lesson 2My Homework 313
Problem Solving Sample answers: 6?9
Solve Exercises 6?9 by rounding to the nearest one.
6. The table shows the average speeds of two airplanes in miles per hour. About how much faster is the Foxbat than the Hawkeye? Show your work.
Plane Hawkeye Foxbat
1,864 - 376 = 1,488 mph
Speed (mph) 375.52
1,864.29
7. Aluminum and tin are both metals. The standard atomic weight for aluminum is 26.98. The standard atomic weight for tin is 118.71. Estimate the difference between the standard atomic weights of these two metals. Show your work.
119 - 27 = 92
8. Lorena and her cousin are fishing at the lake. They caught two largemouth bass. One fish weighs 71.27 ounces and the other fish weighs 38.86 ounces. Estimate the total weight of the two fish. Show your work.
71 + 39 = 110 ounces
9.
4 Model Math The
Trail
A
B
C
D
table shows the lengths of four
trails at a horseback riding camp.
Length (mi) 2.6
1.8
4.2
3.3
Estimate the total length of all the
trails. Show your work.
3 + 2 + 4 + 3 = 12 miles
Copyright ? The McGraw-Hill Companies, Inc.
Test Practice
10. Mr. Dixon bought a whiteboard that was on sale for $1,989.99. The regular price was $2,499.89. Which is the best estimate of the amount of money Mr. Dixon saved by buying the whiteboard on sale?
A $500 B $1,000
C $3,000 D $4,000
314 Need more practice? Download Extra Practice at connectED.mcgraw-
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