Subtract till 20
Calculate:
The number of examples:
Numerical difficulty:
Range of values:
Multiplicity:
12
-
9
=
19
-
7
=
19
-
2
=
15
-
7
=
19
-
3
=
18
-
6
=
10
-
8
=
20
-
9
=
18
-
4
=
18
-
9
=
Math problems
19665
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6047
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4505
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6378
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1079
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3231
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619
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6127
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6831
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3656
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2402
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875
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3333
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93