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A Hundred Is Ten Tens

CONCEPTUAL
Mathematics›Number Representation & Place Value|Ages 7—8|ID: mt_8gy7uxRlF6

Understand that 100 can be thought of as a bundle of ten tens — called a 'hundred'

Mastery Evidence

  • Explain that 10 groups of 10 ones make 100
  • Bundle ten tens sticks into one hundred and describe what happened
  • Represent 100 using base-ten blocks showing 10 tens

Assessment Prompt

“Can [child] explain that ten full tens stacked together make one hundred — and that this is why 100 has a 1 in the hundreds place and zeros in the rest?”

Curriculum Standards1 alignment

2.NBT.1.aCommon Core State Standards for Mathematics
100 as a bundle of ten tens

100 can be thought of as a bundle of ten tens — called a “hundred.”

Number and Operations in Base Ten

Prerequisites2

Show full prerequisite tree
  • A Ten Is Ten Ones hard

    100 as ten tens extends understanding of 10 as ten ones

    • The teen numbers hard

      Understanding 10 as a bundle builds on understanding teen numbers as 'a ten and some ones'

      • How Many in Total? hard

        Understanding tens-and-ones composition requires cardinality — knowing numbers represent quantities

        • One-to-one counting hard

          Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'

      • Reading and writing numbers to 20 hard

        Composing/decomposing teen numbers requires reading and writing those numerals

        • How Many in Total? hard

          Reading/writing numerals 0–20 requires understanding that numerals represent quantities (cardinality)

          • One-to-one counting hard

            Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'

        • Writing digits 0-9 hard

          Writing numerals requires the motor skill of forming digits 0-9 (taught in English handwriting)

  • The two digits of a two-digit number hard

    Must understand two-digit place value before extending to hundreds

    • A Ten Is Ten Ones hard

      Understanding tens and ones place value requires the concept of 10 as a bundle

      • The teen numbers hard

        Understanding 10 as a bundle builds on understanding teen numbers as 'a ten and some ones'

        • How Many in Total? hard

          Understanding tens-and-ones composition requires cardinality — knowing numbers represent quantities

          • One-to-one counting hard

            Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'

        • Reading and writing numbers to 20 hard

          Composing/decomposing teen numbers requires reading and writing those numerals

          • How Many in Total? hard

            Reading/writing numerals 0–20 requires understanding that numerals represent quantities (cardinality)

            • One-to-one counting hard

              Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'

          • Writing digits 0-9 hard

            Writing numerals requires the motor skill of forming digits 0-9 (taught in English handwriting)

    • The teen numbers hard

      General two-digit place value extends from understanding teen number composition

      • How Many in Total? hard

        Understanding tens-and-ones composition requires cardinality — knowing numbers represent quantities

        • One-to-one counting hard

          Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'

      • Reading and writing numbers to 20 hard

        Composing/decomposing teen numbers requires reading and writing those numerals

        • How Many in Total? hard

          Reading/writing numerals 0–20 requires understanding that numerals represent quantities (cardinality)

          • One-to-one counting hard

            Cardinality principle builds on one-to-one correspondence — you must count correctly to know the last number tells 'how many'

        • Writing digits 0-9 hard

          Writing numerals requires the motor skill of forming digits 0-9 (taught in English handwriting)

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