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Students explain errors in calculations that include all operations, decimal values, and percentages.

Students show how they would carry out estimation of multiplication tasks.

Students estimate an addition problem, share their methods, discuss the rounding method, and then do more problems using rounding.

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

Students to show how they estimate in some addition problems.

Students discuss making an interval estimate in multiplication problems (i.e., getting a lower and an upper limit for the actual answer using the front-end and rounding-up estimation methods). They then use this method on two problems.

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

Students show how they estimate in some multiplication problems and come up with sensible estimates.

Students explain multiplication estimation methods used to solve word problems.

This task requires students to show how to estimate numbers of items in some multiplication problems using any acceptable estimation strategy.

Students use rounding to estimate totals then discuss this as a method of estimation.

Students calculate an exact square root and estimate approximate square roots by finding the length of the square flower bed of a given area, and give an explanation for their answers.

Students explain subtraction estimation methods used to solve a word problem.

Students estimate a multiplication problem, share their methods, discuss the rounding method, and then do more estimation problems using rounding.

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

Students write down an explanation of how the front-end estimation strategy works in addition problems to give information on their understanding of the strategy.

Students estimate and explain how they estimated their answer for two number problems: one involving multiplication; and the other division.

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.

Students estimate a division problem, share their methods, discuss the nice numbers and factors method, and then do more problems using nice numbers and factors.

Students estimate a subtraction problem, share their methods, discuss the rounding one number method, and then do more problems by rounding one number.

Students select the best estimate for division and multiplication problems involving stamps, money, and baskets of pinecones.

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

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

In this task students decide which people are estimating and which are not, and explain their reasoning.

Students decide which children are estimating and which are not, and explain their reasoning.