MoMath — Manhattan’s National Museum of Mathematics — is hosting its first Grandparents’ Weekend on Saturday, Sept. 10, and Sunday, Sept. 11.

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The museum, at 11 E. 26th St. in Manhattan, is offering free admission both days to grandparents along with up to two grandchildren. The museum is open from 10 a.m. to 5 p.m. Sunday, incidentally, is National Grandparents Day.

Educator sessions will be offered at 11:30 a.m. and 2 p.m. both days with a guided activity; that workshop costs $8 per person. For more information, call 212-542-0566 or visit momath.org