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Estimated Subtraction - 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 difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
1.  
89
- 50
Estimate 		2.  
57
- 22
Estimate

Complexity=100

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
1.  
129
- 49
Estimate 		2.  
138
- 63
Estimate

Complexity=200

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
1.  
222
- 98
Estimate 		2.  
174
- 111
Estimate

Complexity=700

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
1.  
1233
- 586
Estimate 		2.  
751
- 445
Estimate

Complexity=1000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
1.  
1247
- 783
Estimate 		2.  
1024
- 597
Estimate

Complexity=5000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
1.  
7596
- 3493
Estimate 		2.  
7483
- 3896
Estimate

Complexity=10000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
1.  
15988
- 8972
Estimate 		2.  
18360
- 9839
Estimate

Complexity=20000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
1.  
21692
- 11453
Estimate 		2.  
20272
- 10574
Estimate

Complexity=100000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
1.  
127745
- 30669
Estimate 		2.  
102994
- 69025
Estimate

Answers

Complexity=60

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
#ProblemCorrect AnswerYour Answer
1
89
- 50
 Estimate
Solution
To get the estimated answer, estimate each operand.
89 => 90
50 => 50
90 - 50 = 40

Alternate Answer
89 => 89
50 => 50
89 - 50 = 39

#ProblemCorrect AnswerYour Answer
2
57
- 22
 Estimate
Solution
To get the estimated answer, estimate each operand.
57 => 60
22 => 20
60 - 20 = 40

Alternate Answer
57 => 57
22 => 22
57 - 22 = 35

Complexity=100

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
#ProblemCorrect AnswerYour Answer
1
129
- 49
 Estimate
Solution
To get the estimated answer, estimate each operand.
129 => 130
49 => 50
130 - 50 = 80

Alternate Answer
129 => 100
49 => 50
100 - 50 = 50

#ProblemCorrect AnswerYour Answer
2
138
- 63
 Estimate
Solution
To get the estimated answer, estimate each operand.
138 => 140
63 => 60
140 - 60 = 80

Alternate Answer
138 => 100
63 => 60
100 - 60 = 40

Complexity=200

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
#ProblemCorrect AnswerYour Answer
1
222
- 98
 Estimate
Solution
To get the estimated answer, estimate each operand.
222 => 220
98 => 100
220 - 100 = 120

Alternate Answer
222 => 200
98 => 100
200 - 100 = 100

#ProblemCorrect AnswerYour Answer
2
174
- 111
 Estimate
Solution
To get the estimated answer, estimate each operand.
174 => 170
111 => 110
170 - 110 = 60

Alternate Answer
174 => 200
111 => 100
200 - 100 = 100

Complexity=700

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
#ProblemCorrect AnswerYour Answer
1
1233
- 586
 Estimate
Solution
To get the estimated answer, estimate each operand.
1233 => 1200
586 => 600
1200 - 600 = 600

Alternate Answer
1233 => 1000
586 => 600
1000 - 600 = 400

#ProblemCorrect AnswerYour Answer
2
751
- 445
 Estimate
Solution
To get the estimated answer, estimate each operand.
751 => 800
445 => 400
800 - 400 = 400

Alternate Answer
751 => 750
445 => 450
750 - 450 = 300

Complexity=1000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
#ProblemCorrect AnswerYour Answer
1
1247
- 783
 Estimate
Solution
To get the estimated answer, estimate each operand.
1247 => 1200
783 => 800
1200 - 800 = 400

Alternate Answer
1247 => 1000
783 => 800
1000 - 800 = 200

#ProblemCorrect AnswerYour Answer
2
1024
- 597
 Estimate
Solution
To get the estimated answer, estimate each operand.
1024 => 1000
597 => 600
1000 - 600 = 400

Alternate Answer
1024 => 1000
597 => 600
1000 - 600 = 400

Complexity=5000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
#ProblemCorrect AnswerYour Answer
1
7596
- 3493
 Estimate
Solution
To get the estimated answer, estimate each operand.
7596 => 8000
3493 => 3000
8000 - 3000 = 5000

Alternate Answer
7596 => 7600
3493 => 3500
7600 - 3500 = 4100

#ProblemCorrect AnswerYour Answer
2
7483
- 3896
 Estimate
Solution
To get the estimated answer, estimate each operand.
7483 => 7000
3896 => 4000
7000 - 4000 = 3000

Alternate Answer
7483 => 7500
3896 => 3900
7500 - 3900 = 3600

Complexity=10000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
#ProblemCorrect AnswerYour Answer
1
15988
- 8972
 Estimate
Solution
To get the estimated answer, estimate each operand.
15988 => 16000
8972 => 9000
16000 - 9000 = 7000

Alternate Answer
15988 => 20000
8972 => 9000
20000 - 9000 = 11000

#ProblemCorrect AnswerYour Answer
2
18360
- 9839
 Estimate
Solution
To get the estimated answer, estimate each operand.
18360 => 18000
9839 => 10000
18000 - 10000 = 8000

Alternate Answer
18360 => 20000
9839 => 10000
20000 - 10000 = 10000

Complexity=20000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
#ProblemCorrect AnswerYour Answer
1
21692
- 11453
 Estimate
Solution
To get the estimated answer, estimate each operand.
21692 => 20000
11453 => 10000
20000 - 10000 = 10000

Alternate Answer
21692 => 22000
11453 => 11000
22000 - 11000 = 11000

#ProblemCorrect AnswerYour Answer
2
20272
- 10574
 Estimate
Solution
To get the estimated answer, estimate each operand.
20272 => 20000
10574 => 10000
20000 - 10000 = 10000

Alternate Answer
20272 => 20000
10574 => 11000
20000 - 11000 = 9000

Complexity=100000

Estimate the difference using the highest practical magnitude.
Example 1: 53 - 19 => 50 - 20
Example 2: 123 - 57 => 120 - 60
Example 3: 3898 - 2301 => 4000 - 2000
#ProblemCorrect AnswerYour Answer
1
127745
- 30669
 Estimate
Solution
To get the estimated answer, estimate each operand.
127745 => 130000
30669 => 30000
130000 - 30000 = 100000

Alternate Answer
127745 => 100000
30669 => 30000
100000 - 30000 = 70000

#ProblemCorrect AnswerYour Answer
2
102994
- 69025
 Estimate
Solution
To get the estimated answer, estimate each operand.
102994 => 100000
69025 => 70000
100000 - 70000 = 30000

Alternate Answer
102994 => 100000
69025 => 70000
100000 - 70000 = 30000

Learn more about our online math practice software.

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