Rounding
Estimating sums/differences
Adding Decimals
Subtracting Decimals
Word Problems
100

Round the number to the nearest tenth:

34.56

34.6

100

Estimate the sum by rounding to the nearest tenths place: $43.21+$11.76

$55.00

100

12.5+10.4

22.9

100

20.9-10.5

10.4

100

Amanda spent $3.50 on a small coffee and $1.50 on a chocolate chip cookie at Starbucks. What was the total amount she spent?

$5.00

200

Round the number to the nearest thousandths:


2.782

2.78

200

Estimate the difference by rounding to the nearest tenth: 10.62-0.37

10.2

200

32.2+20.3

52.5

200

28.8-4.56

24.24

200

Kelly and Mike were online shopping on amazon. Kelly's total was $87.34, Mike's total was $110.20. How much more money did Mike spend than Kelly?

$22.86

300

Round the number to the nearest hundredth:


289.629

289.63

300

Estimate the sum by rounding to the nearest tenth: 87.54+62.89

150.4

300

124+3.5

127.5

300

177-36.2

140.8

300

Emily bought a Ps5 for $499 and a headset for $28.65. How much money did Emily spend in all?

$527.64

400

Round to the whole number:


456.02

456

400

Estimate the difference by rounding to the nearest tenth: 20.78-12.36

8.4

400

23.62+57.21

80.83

400

0.46-0.38

0.08

400
Mrs.Lee bought three shelves for her classroom library. The middle shelf is 2.43 feet long, the top shelf is 4.76 feet long, and the bottom shelf is 6.88 feet long.


1) What is the combined length of the three shelves?

2) How much longer is the top shelf from the middle shelf?

1) 14.07 feet

2) 2.33 feet longer

500

Round to the nearest tenths:

87.98

88

500

Estimate the sum by rounding to the nearest tenth: $167.02+$203.87

$370.9

500

172.94+52.006

224.946

500

200.00-76.32

123.68

500

Miss.Martin has $100, she bought a pair of shoes for $35.75, a sweatshirt for $44.99, and a pair of jeans for $50.00. How much more money will Miss.Martin need in order to pay her total?

1.What do you need to do first before solving this problem?

2. How much more money does Miss.Martin need?

1. Find the total= $130.74

2. Subtract $130.74-$100

     $30.74