Rounding
Estimating Sums & Differences
Place Value of the 9
Sums and Differences (Actually Add & Subtract)
Random
100
69.86 rounded to the nearest tenth
69.9
100
8.9 + 6.1
What is 15
100
18.9
Tenths


100
3.12+14.16
What is 17.28
100
7 x 1.5
What is 10.5
200
89.43 rounded to the nearest one
What is 89
200

9.9 - 4.2

6
200
93.0
Tens
200
20.9 - 15.7
What is 5.2
200
Ms. Koch ran a 100m dash in 33.2 seconds. Mrs. Lynch ran it in 35.7 seconds. Who ran faster? AND by how much? 
Ms. Koch by 2.5 seconds
300
765.13 rounded to the nearest hundred
What is 800
300
75.8 + 3.5
What is 80
300
54.6 - 9.1
What is 46
300
98.54 - 16.4
What is 82.14
300
$43 x .10
$4.30
400
293.06 rounded to the nearest tenth
293.1


400
108.5 + 211.9
What is 321
400
700.891
Hundredths
400
10.8 + 843.57
What is 854.37
400
Which number is greater? 


178.23

178.90

178.90
500
99.99 rounded to the nearest one
100
500

89.5 - 15.08

75
500
783. 019
Thousandths
500
197.83 - 19.4
What is 178.43
500
Ms. Koch collected $1.25 from each student in her math class for a special project. How much money did she collect?
$28.75


1.25 x 23 = 

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