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Student solve addition problems where the missing value is located in different positions. This may mean that students transform the problem into a subtraction one. Students reflect on the easiest and hardest problems, and explain their choice.

Students use estimation strategies to calculate the number of vegetables they can buy with given amounts of money.

Students estimate an addition problem, share their methods, discuss grouping nice numbers, and then do a problem using this method, then design a question showing how it uses the method.

This task requires students to estimate some addition problems using any appropriate method.

Students estimate a multiplication problem, share their methods, discuss the front-end method, and then do more problems using front-end.

Students to show how to calculate problems that involve rates and ratios.