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Introduces subtraction by showing groups of different objects, taking some away, and asking the reader how many are left.

Introduces dump trucks and describes how they are able to carry large items in their bed or box and are

Explains the concept of time, looks at how time is measured in months, and discusses some of the events and

In a world of changing global temperatures both on land and in the sea, the annual migrations of animals include

Words can move mountains. A great speech has the power to make people care about something that they might never