Decimal Tic-Tac-Toe has 79 printable pages on decimals. Each page has 36 to 81 one- or two-step decimal problems and lists the Common Core State Standard that it addresses:
Add, subtract, and multiply decimals to hundredths: CCSS.Math.5.NBT.B.7
Compare decimals to hundredths: CCSS.Math.4.NBT.A.2 and 4.NF.C.7
Compare decimals to thousandths CCSS.Math.5.NBT.A.3b
Read and write decimals to thousandths (expanded form, number name, base-ten numeral) CCSS.Math.5.NBT.A.3a
Round decimals to any place CCSS.Math.5.NBT.A.4
There is no need for late-night grading since each player must check the answer of their opponent (an incorrect response results in a loss of turn).
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If you would like more Tic-Tac-Toe, here are more in this series:
Long Multiplication Tic-Tac-Toe
Compound Words Tic-Tac-Toe
Synonyms: a new game of Tic-Tac-Toe