Subtract till 20
Calculate:
The number of examples:
Numerical difficulty:
Range of values:
Multiplicity:
19
-
7
=
15
-
9
=
13
-
2
=
13
-
8
=
14
-
7
=
13
-
6
=
14
-
6
=
18
-
9
=
10
-
2
=
7
-
4
=
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876
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3333
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