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Mathematics problems in primary schools. Thank you.
Every 6 groups.

50 ÷ 6 = 8 ...2

A: The 50th number from left to right is 4.

100÷6= 16…… 4

( 1+4+2+8+5+7)× 16+ 1+4+2+8=447

A: The sum of the numbers 100 is 447.

10-4+ 1=7

Answer: Then the seventh chubby card from front to back.

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