Take-away game (logic)
A pile of 8 to 25 counters, shells or cookies, and two players who take turns to take some of them: 1 or 2, up to 3, or up to 4. Whoever takes the last one wins, or in some games loses. The student finds how many to take now to be sure of winning. In some questions a few moves have already been made, so the pile left has to be worked out first.
The key is the times table one more than the most you can take: leave the other player a number in it, and whatever they take, you make it up to that number. Once the answer is shown, the student can play the rest of the game against the computer.
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What changes each time
- Piles of 8 to 25, taking up to 2, 3 or 4 at a time
- Last one wins, or last one loses
- Sometimes one to three moves already made
More patterns, sequences and logic practice
- Skip counting (Grade 1)
- Repeating patterns (Grade 1)
- Hundred chart: 10 more and 10 less (Grade 1)
- Number sequences (Grade 2)
- Number machines (Grade 2)
- Multiples on a hundred chart (Grade 3)
- Ordering from clues (logic) (Grade 3)
- How many to be sure? (logic) (Grade 3)
- Truth-tellers and fibbers (logic) (Grade 3)
- Logic grid puzzles (Grade 3)
- Cook it faster (Grade 5)
- Growing patterns (Grade 4)
- Doubling every day (Grade 4)
- Bigger start or bigger raise? (Grade 4)