Lesson 227 of 500 · Extra Passages

Subtraction to 20 Part 4

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Have you ever wondered about Subtraction to 20? It is a fascinating subject. Many discoveries have been made about Subtraction to 20. Studying Subtraction to 20 helps us understand the world around us.

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Question 1

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According to the passage, what does studying Subtraction to 20 help develop?