Sum or Difference
Sum or Difference
Front-end Estimation
Rouding
Estimate or Exact Answer
100
98 + 46
What is 144
100
9,004 - 5,762
What is 3,242
100
85,103 - 76,495
What is 10,000
100
16,453 - 11,019
What is 10,000
100
Does this need an estimate or exact answer and then solve. The school cafeteria served 115 cartons of whole milk, 78 cartons of chocolate milk and 35 cartons of orange juice. About how many drinks were served?
What is estimate and 240 drinks
200
109 - 94
What is 15
200
1,241 + 1,367 + 495
What is 3,103
200
405,501 + 570,201
What is 900,000
200
678,401 + 259,345
What is 1,000,000
200
Does this need an estimate or exact answer and then solve. Ellie will win a prize if she sells 400 boxes of cookies this year. If she sold 113 in January, 107 in February, and 68 in March, how many more boxes does she need to sell to win the prize?
What is exact and 112 more
300
64 - 23
What is 41
300
7,060 - 1,515
What is 5,545
300
854,633 + 941,053
What is 1,700,000
300
27,645 - 10,067
What is 20,000
300
Does this need an estimate or exact answer and then solve. Joe earns $8.75 an hour. How much does he earn in 4 hours?
What is exact and $35
400
346 + 79
What is 425
400
2,435 + 2,576
What is 5,011
400
457,249 - 350,978
What is 100,000
400
546,219 + 732,911
What is 1,200,000
400
Does this need an estimate or exact answer and then solve. A road map shows that the Gradys must travel 126 miles south and 203 miles east to get to the ocean. About how are must they travel?
What is estimate and 300
500
625 +292 ______
What is 917
500
1,600 - 1,041
What is 559
500
765,321 + 987,654
What is 1,600,000
500
1,474,255 - 987,654
What is 0
500
Does this need an estimate or exact answer and then solve. Two science classes need science books. There are 25 stuedents in one of the classes and 32 students in the other class. How many science books are needed if each student gets a book?
What is exact and 57
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