Just in case a challenge is in order!
Open Middle: Computation practice in puzzle form.
NIM Puzzles (by SD43’s Rob Heinrichs). Great for computational thinking.
Mancala: Have an egg carton? If so, you can create and play this ancient strategy game!
The Fold and Cut Challenge (by Games for Young Minds): Excellent challenges that require no more than scrap paper, scissors, visualization and a willingness to persevere! Clear, detailed scaffolds for both primary and intermediate.
Don’t Connect the Dots! (by Games for Young Minds) Another excellent strategy game that requires no more than pencil, paper and lots of thinking.
Factors and Multiples (by Nrich Maths). Play alone, cooperatively or competitively. Make a string of multiples and factors using the numbers 1-100. Try to constantly beat your record!