A Hundred Is Ten Tens
Understand that 100 can be thought of as a bundle of ten tens — called a 'hundred'
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Explain one hundred as ten tens, including zero placeholders.
Explain one hundred as ten tens, including zero placeholders.
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Illustrative Mathematics · Practice link — not the full lesson
Ten $10s make $100
Before you open · source notes
Ten ten-dollar bills make one hundred dollars, connecting ten tens to one hundred. Money vocabulary is US dollars; treat amounts as fictional classroom money.
Free, no sign-in. A teacher solution is on the same page, so use the student view with your child.
Before you openAsk why ten groups of ten make one hundred. Do not treat this as a shopping or cash-handling lesson.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public Illustrative Mathematics task page. The .html address responds HTTP 308 to this URL. An anonymous GET of this URL on 2026-11-11 returned HTTP 200 with no login or payment prompt. Where a teacher solution is present, it is on the same page as the student task; this check did not find a separate locked student view. An adult can use the student view section and should not read a solution aloud. Advertising was not observed in the fetched HTML text; that is not a browser, device, or ad-free guarantee. This is a paper or discussion task, not an automatically marked interactive game. Opening the link does not save practice or assess mastery. Diagrams on the page use missing or filename-only alt text, so they are not an accessible image equivalent. Accessibility still depends on an adult describing the picture.
Illustrative Mathematics. “Ten $10s make $100.” Licensed CC BY-NC-SA 4.0. External task; Gakuva does not copy, host, embed, or redistribute it.
CC BY-NC-SA 4.0 — link only
Check understanding
- 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
“Can your 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 record
- Type
- Conceptual
- Subject
- Mathematics
- Domain
- Number Representation & Place Value
- Age range
- Ages 6–9
Standards