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Estimated Addition - Sample Math Practice Problems

The math problems below can be generated by MathScore.com, a math practice program for schools and individual families. References to complexity and mode refer to the overall difficulty of the problems as they appear in the main program. In the main program, all problems are automatically graded and the difficulty adapts dynamically based on performance. Answers to these sample questions appear at the bottom of the page. This page does not grade your responses.

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Complexity=60

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
1.  
42
+ 32
Estimate 		2.  
38
+ 60
Estimate

Complexity=100

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
1.  
76
+ 90
Estimate 		2.  
62
+ 94
Estimate

Complexity=200

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
1.  
85
+ 173
Estimate 		2.  
79
+ 95
Estimate

Complexity=700

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
1.  
676
+ 515
Estimate 		2.  
320
+ 378
Estimate

Complexity=1000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
1.  
569
+ 705
Estimate 		2.  
822
+ 977
Estimate

Complexity=5000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
1.  
2133
+ 4328
Estimate 		2.  
4899
+ 3829
Estimate

Complexity=10000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
1.  
9037
+ 5211
Estimate 		2.  
9449
+ 8608
Estimate

Complexity=20000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
1.  
19020
+ 19813
Estimate 		2.  
12812
+ 17717
Estimate

Complexity=100000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
1.  
78592
+ 93412
Estimate 		2.  
97819
+ 85743
Estimate

Answers

Complexity=60

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
#ProblemCorrect AnswerYour Answer
1
42
+ 32
 Estimate
Solution
To get the estimated answer, estimate each operand.
42 => 40
32 => 30
40 + 30 = 70

Alternate Answer
42 => 42
32 => 32
42 + 32 = 74

#ProblemCorrect AnswerYour Answer
2
38
+ 60
 Estimate
Solution
To get the estimated answer, estimate each operand.
38 => 40
60 => 60
40 + 60 = 100

Alternate Answer
38 => 38
60 => 60
38 + 60 = 98

Complexity=100

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
#ProblemCorrect AnswerYour Answer
1
76
+ 90
 Estimate
Solution
To get the estimated answer, estimate each operand.
76 => 80
90 => 90
80 + 90 = 170

Alternate Answer
76 => 76
90 => 90
76 + 90 = 166

#ProblemCorrect AnswerYour Answer
2
62
+ 94
 Estimate
Solution
To get the estimated answer, estimate each operand.
62 => 60
94 => 90
60 + 90 = 150

Alternate Answer
62 => 62
94 => 94
62 + 94 = 156

Complexity=200

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
#ProblemCorrect AnswerYour Answer
1
85
+ 173
 Estimate
Solution
To get the estimated answer, estimate each operand.
85 => 90
173 => 170
90 + 170 = 260

Alternate Answer
85 => 90
173 => 200
90 + 200 = 290

#ProblemCorrect AnswerYour Answer
2
79
+ 95
 Estimate
Solution
To get the estimated answer, estimate each operand.
79 => 80
95 => 100
80 + 100 = 180

Alternate Answer
79 => 79
95 => 95
79 + 95 = 174

Complexity=700

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
#ProblemCorrect AnswerYour Answer
1
676
+ 515
 Estimate
Solution
To get the estimated answer, estimate each operand.
676 => 700
515 => 500
700 + 500 = 1200

Alternate Answer
676 => 680
515 => 520
680 + 520 = 1200

#ProblemCorrect AnswerYour Answer
2
320
+ 378
 Estimate
Solution
To get the estimated answer, estimate each operand.
320 => 320
378 => 380
320 + 380 = 700

Alternate Answer
320 => 300
378 => 400
300 + 400 = 700

Complexity=1000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
#ProblemCorrect AnswerYour Answer
1
569
+ 705
 Estimate
Solution
To get the estimated answer, estimate each operand.
569 => 600
705 => 700
600 + 700 = 1300

Alternate Answer
569 => 570
705 => 710
570 + 710 = 1280

#ProblemCorrect AnswerYour Answer
2
822
+ 977
 Estimate
Solution
To get the estimated answer, estimate each operand.
822 => 800
977 => 1000
800 + 1000 = 1800

Alternate Answer
822 => 820
977 => 980
820 + 980 = 1800

Complexity=5000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
#ProblemCorrect AnswerYour Answer
1
2133
+ 4328
 Estimate
Solution
To get the estimated answer, estimate each operand.
2133 => 2000
4328 => 4000
2000 + 4000 = 6000

Alternate Answer
2133 => 2100
4328 => 4300
2100 + 4300 = 6400

#ProblemCorrect AnswerYour Answer
2
4899
+ 3829
 Estimate
Solution
To get the estimated answer, estimate each operand.
4899 => 5000
3829 => 4000
5000 + 4000 = 9000

Alternate Answer
4899 => 4900
3829 => 3800
4900 + 3800 = 8700

Complexity=10000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
#ProblemCorrect AnswerYour Answer
1
9037
+ 5211
 Estimate
Solution
To get the estimated answer, estimate each operand.
9037 => 9000
5211 => 5000
9000 + 5000 = 14000

Alternate Answer
9037 => 9000
5211 => 5200
9000 + 5200 = 14200

#ProblemCorrect AnswerYour Answer
2
9449
+ 8608
 Estimate
Solution
To get the estimated answer, estimate each operand.
9449 => 9000
8608 => 9000
9000 + 9000 = 18000

Alternate Answer
9449 => 9400
8608 => 8600
9400 + 8600 = 18000

Complexity=20000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
#ProblemCorrect AnswerYour Answer
1
19020
+ 19813
 Estimate
Solution
To get the estimated answer, estimate each operand.
19020 => 19000
19813 => 20000
19000 + 20000 = 39000

Alternate Answer
19020 => 20000
19813 => 20000
20000 + 20000 = 40000

#ProblemCorrect AnswerYour Answer
2
12812
+ 17717
 Estimate
Solution
To get the estimated answer, estimate each operand.
12812 => 13000
17717 => 18000
13000 + 18000 = 31000

Alternate Answer
12812 => 10000
17717 => 20000
10000 + 20000 = 30000

Complexity=100000

Estimate the sum using the highest practical magnitude.
Example 1: 53 + 19 => 50 + 20
Example 2: 123 + 57 => 120 + 60
Example 3: 1598 + 2301 => 2000 + 2000
#ProblemCorrect AnswerYour Answer
1
78592
+ 93412
 Estimate
Solution
To get the estimated answer, estimate each operand.
78592 => 80000
93412 => 90000
80000 + 90000 = 170000

Alternate Answer
78592 => 79000
93412 => 93000
79000 + 93000 = 172000

#ProblemCorrect AnswerYour Answer
2
97819
+ 85743
 Estimate
Solution
To get the estimated answer, estimate each operand.
97819 => 100000
85743 => 90000
100000 + 90000 = 190000

Alternate Answer
97819 => 98000
85743 => 86000
98000 + 86000 = 184000

Learn more about our online math practice software.

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