On Wednesday, we counted how many "fossils" were in each piece of "dirt". Today, we added the total number of "fossils" found by all of the children. First the children estimated how many they thought had been found in all and then children counted using base ten blocks and ones cubes.
Then the children helped to work out the average number of "fossils" in each piece of "dirt".
Estimating the total number of "fossils".
Below you can see that each student used tens and ones to add the number of fossils he or she found.
They traded ones for tens.
Then they traded tens for hundreds.
Ty's estimate was the closest. He guessed 301 and there were actually 312!
We shared the cubes equally between the children and discovered that each child had 19.5 cubes.
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