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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
+ 53
Estimate
2.  
43
+ 48
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.  
57
+ 49
Estimate
2.  
30
+ 99
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.  
65
+ 184
Estimate
2.  
142
+ 165
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.  
536
+ 618
Estimate
2.  
303
+ 298
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.  
770
+ 431
Estimate
2.  
943
+ 592
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.  
2390
+ 4611
Estimate
2.  
4672
+ 3802
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.  
7742
+ 5030
Estimate
2.  
9495
+ 9118
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.  
18550
+ 10068
Estimate
2.  
12435
+ 16346
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.  
94234
+ 79830
Estimate
2.  
83119
+ 79859
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
+ 53
Estimate
Solution
To get the estimated answer, estimate each operand.
42 => 40
53 => 50
40 + 50 = 90

Alternate Answer
42 => 42
53 => 53
42 + 53 = 95

#ProblemCorrect AnswerYour Answer
2
43
+ 48
Estimate
Solution
To get the estimated answer, estimate each operand.
43 => 40
48 => 50
40 + 50 = 90

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
57
+ 49
Estimate
Solution
To get the estimated answer, estimate each operand.
57 => 60
49 => 50
60 + 50 = 110

Alternate Answer
57 => 57
49 => 49
57 + 49 = 106

#ProblemCorrect AnswerYour Answer
2
30
+ 99
Estimate
Solution
To get the estimated answer, estimate each operand.
30 => 30
99 => 100
30 + 100 = 130

Alternate Answer
30 => 30
99 => 99
30 + 99 = 129


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
65
+ 184
Estimate
Solution
To get the estimated answer, estimate each operand.
65 => 70
184 => 180
70 + 180 = 250

Alternate Answer
65 => 70
184 => 200
70 + 200 = 270

#ProblemCorrect AnswerYour Answer
2
142
+ 165
Estimate
Solution
To get the estimated answer, estimate each operand.
142 => 140
165 => 170
140 + 170 = 310

Alternate Answer
142 => 100
165 => 200
100 + 200 = 300


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
536
+ 618
Estimate
Solution
To get the estimated answer, estimate each operand.
536 => 500
618 => 600
500 + 600 = 1100

Alternate Answer
536 => 540
618 => 620
540 + 620 = 1160

#ProblemCorrect AnswerYour Answer
2
303
+ 298
Estimate
Solution
To get the estimated answer, estimate each operand.
303 => 300
298 => 300
300 + 300 = 600

Alternate Answer
303 => 300
298 => 300
300 + 300 = 600


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
770
+ 431
Estimate
Solution
To get the estimated answer, estimate each operand.
770 => 800
431 => 400
800 + 400 = 1200

Alternate Answer
770 => 770
431 => 430
770 + 430 = 1200

#ProblemCorrect AnswerYour Answer
2
943
+ 592
Estimate
Solution
To get the estimated answer, estimate each operand.
943 => 900
592 => 600
900 + 600 = 1500

Alternate Answer
943 => 940
592 => 590
940 + 590 = 1530


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
2390
+ 4611
Estimate
Solution
To get the estimated answer, estimate each operand.
2390 => 2000
4611 => 5000
2000 + 5000 = 7000

Alternate Answer
2390 => 2400
4611 => 4600
2400 + 4600 = 7000

#ProblemCorrect AnswerYour Answer
2
4672
+ 3802
Estimate
Solution
To get the estimated answer, estimate each operand.
4672 => 5000
3802 => 4000
5000 + 4000 = 9000

Alternate Answer
4672 => 4700
3802 => 3800
4700 + 3800 = 8500


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
7742
+ 5030
Estimate
Solution
To get the estimated answer, estimate each operand.
7742 => 8000
5030 => 5000
8000 + 5000 = 13000

Alternate Answer
7742 => 7700
5030 => 5000
7700 + 5000 = 12700

#ProblemCorrect AnswerYour Answer
2
9495
+ 9118
Estimate
Solution
To get the estimated answer, estimate each operand.
9495 => 9500
9118 => 9100
9500 + 9100 = 18600

Alternate Answer
9495 => 9000
9118 => 9000
9000 + 9000 = 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
18550
+ 10068
Estimate
Solution
To get the estimated answer, estimate each operand.
18550 => 19000
10068 => 10000
19000 + 10000 = 29000

Alternate Answer
18550 => 20000
10068 => 10000
20000 + 10000 = 30000

#ProblemCorrect AnswerYour Answer
2
12435
+ 16346
Estimate
Solution
To get the estimated answer, estimate each operand.
12435 => 12000
16346 => 16000
12000 + 16000 = 28000

Alternate Answer
12435 => 10000
16346 => 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
94234
+ 79830
Estimate
Solution
To get the estimated answer, estimate each operand.
94234 => 90000
79830 => 80000
90000 + 80000 = 170000

Alternate Answer
94234 => 94000
79830 => 80000
94000 + 80000 = 174000

#ProblemCorrect AnswerYour Answer
2
83119
+ 79859
Estimate
Solution
To get the estimated answer, estimate each operand.
83119 => 80000
79859 => 80000
80000 + 80000 = 160000

Alternate Answer
83119 => 83000
79859 => 80000
83000 + 80000 = 163000

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