Twenty seven
This is a level 2 number activity from the Figure It Out series. It relates to Stage 5 of the Number Framework.
About this resource
Figure It Out is a series of 80 books published between 1999 and 2009 to support teaching and learning in New Zealand classrooms.
This resource provides the teachers notes' and answers for one activity from the Figure It Out series. A printable PDF of the student activity can be downloaded from the materials that come with this resource.
Specific learning outcomes:
- Use simple additive strategies to solve problems.
- Use addition facts to solve problems.
Twenty seven
Achievement objectives
NA2-1: Use simple additive strategies with whole numbers and fractions.
Required materials
- arrays, rods in a number track, or hundreds board to with addition (optional)
- classmate
- counter
- Figure It Out, Level 2-3, Basic Facts, "Twenty-seven", page 15
See Materials that come with this resource to download:
- Twenty seven activity (.pdf)
Activity
Game
This is an excellent strategy game as well as providing a good opportunity for basic facts practice. Students can investigate winning positions, for example.
The score is 19. It is Joel's turn.
- Can he win?
- How?
Students will need to look at the implications of Joel’s potential moves: to 4, with the score on 23; to 5, with the score on 24; to 2, with the score on 21. If he moves to 4, his opponent will push the counter to 3. This will trap Joel since any next move will push the score over 27. If he moves to 5, his opponent will push the counter to 3 to make the score up to 27. If he moves to 2, his opponent will go to 3 and put the score at 24. Joel can then only go to 2, leaving his opponent to move to 1, bringing the score total to 27. In short, Joel cannot win.
Other winning positions depend on the number the counter is on at a particular total.
A game of strategy with addition.
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