Estimate quantities less than 1000 ...

by estimating the number of groups of ten in a given quantity.

Bear


by estimating the number of groups of a hundred in a given quantity.

Estimate
by estimating a given quantity by comparing it to another quantity.

Comparison EstimatorMore Or Less
by estimating a given quantity by choosing from three possible choices.

EstimatorHacker


by selecting a way to estimate a given quantity and explain your choice.

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