About how many ducks are there?, About 10 ducks, About 20 ducks, About 30 ducks, Estimate 23 to the nearest tens., 20, 30, 40, Estimate 37 to the nearest tens., 20, 30, 40, There are ______ 20 boats., exact, about, more, There are about 30 balls. Which number could be the exact number?, 13, 28, 47, There are 42 vans. What is a good estimate?, About 20 vans, About 40 vans, About 60 vans, 64 is closer to ______., 50, 60, 70, Estimate 88 to the nearest tens., 90, 80, 85, Which sentence is correct?, There are about 10 rulers., There are about 20 rulers., There are about 30 rulers.

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