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Math problems of pupils in the fourth grade
Divided into 10 equal parts, with 10- 1=9 tags.

Divided into 12 equal parts, there are12-1=1/markers.

Divided into 15 equal parts, with 15- 1= 14 markers.

10÷2= 15÷3

The bisector of 10 and the bisector of 15 are duplicated: 10÷2- 1=4.

12÷4= 15÷5

The bisector of 12 and the bisector of 15 are duplicated: 12÷4- 1=2.

10÷5= 12÷6

10 bisector and 12 bisector repeat: 10÷5- 1= 1.

All three marks are repeated, no.

The symbol1* * has: 9+11+14-4-2-1= 27.

You can cut the rope into 27+ 1=28 segments.