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A Ten Is Ten Ones

CONCEPTUAL
Mathematics›Number Representation & Place Value|Ages 6—7|ID: mt_r0VXbfAmsH

Understand that 10 can be thought of as a bundle of ten ones — called a 'ten'

Mastery Evidence

  • Group 10 single cubes into one rod of 10 and explains why
  • Explain that 10 ones is the same as 1 ten
  • Exchange 10 ones for a single tens block

Assessment Prompt

“Can [child] explain that ten single objects bundled together make 'one ten' — and that this is why we write 10 with a 1 in the tens place and a 0 in the ones place?”

Curriculum Standards1 alignment

1.NBT.2.aCommon Core State Standards for Mathematics
10 as a bundle of ten ones

10 can be thought of as a bundle of ten ones — called a “ten.”

NBT

Prerequisites1

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  • 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)

Unlocks3