Mathematics:
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Arithmetic
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Subtract till 20
Calculate:
Number of examples:
Numerical difficulty:
Range of values:
Multiplicity:
8

4
=
14

5
=
19

9
=
15

7
=
6

4
=
7

3
=
13

9
=
12

5
=
13

2
=
9

7
=
all examples
3850
5th grade (10y)
384
6th grade (11y)
948
7th grade (12y)
1539
8th grade (13y)
2022
9th grade (14y)
1809
high school
1294
equation
932
reason
640
time
528
right triangle
527
system of equations
513
triangle
475
area of shape
452
Pythagorean theorem
449
volume
439
percentages
410
unit conversion
404
length
400
expression of a variable from formula
398
body volume
371
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