Problem set #1.
These addition and subtraction problems represent four different problem structures. These structures are based on CGI probem types. (For more information about CGI, see this book.)
1. Maya has 13 jellybeans. Her brother gives her 8 more jellybeans. How many jellybeans does Maya have now? Join Result Unknown
2. Jason has 28 pennies. He loses 13 of them. How many pennies does Jason have now? Separate Result Unknown
3. Eric is putting candles on a birthday cake for his brother. There are 4 candles on the cake so far. How many more candles does Eric need to put on the cake so that there are 7 candles altogether? Join Change Unknown [not given]
4. Sarita has 9 toy rockets. Her brother George has 6 toy rockets. How many more toy rockets does Sarita have than George? Compare Difference Unknown [not given]
Created during instruction: You’ve got 3 big bags of soccer balls. Each bag has 10 balls in it. You’ve also got 2 loose balls. How many balls do you have?
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