Numbers to 100

Japanese school year: Elementary 1

What you learn

Students learn how to read, write, and compare numbers up to 100 by focusing on groups of ten and place value. These skills are helpful for counting money, scores, or calendar dates. Being comfortable counting and recognizing numbers up to 20 provides a solid foundation for this topic.

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Key points

This equation shows the structure of the number $100$ . Ten groups of $10$ combine to carry over to the next place value, making $100$ .

10 \times 10 = 100

This algebraic expression represents a two-digit integer in base-10. With tens digit $a$ and ones digit $b$ , the total value equals $a$ tens plus $b$ ones ( $10a + b$ ).

10a + b

This is the procedure for comparing two-digit integers. First compare the higher-order tens digits; if they are equal, compare the ones digits to determine which number is greater.

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Practice 1Coming soon