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A lesson on addition and subtraction using calculators
4, 3, 2
Topic: Addition and Subtraction with Calculators
Grade Level: 2 – 4
Name of Activities: Nim
Now You’re 21
7 – Up
1 1 Down
Materials Needed: Calculator
Description of Activity:
NIM – This is a partner activity, so first place everyone with a partner. Have them
punch in the number 21 on their calculators. The two players alternate turns. During
their turn they must subtract 1, 2, or 3 from the number on the calculator. Continue
until one person reaches zero or a negative number. This person is the looser.
Now You’re 21 – Same rules apply as above, except start with zero and add 1, 2, or 3.
First to reach 21 wins.
7 – Up – Same rules apply. Start with zero, add one or two. First to the number seven is the winner.
11 – Down – Same rules apply. Start with eleven, subtract one or two. First to reach zero is the winner.
2001 – Same rules apply, enter 2001, subtract 1 – 99 on each turn. First to reach zero is the winner.
*** This activity can be modified to fit the level that the students are at.
*** You can play the game with other numbers, perhaps start with the number of the
day, birthdays, etc.