Missa
MISSING-DIGIT / CASTING OUT NINES
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Missa did the trick that made audiences gasp. "Cross out any digit of your answer — don't tell me which," Missa would say, "then read me the rest, in any order." The volunteer would hide a digit and mumble the others. Missa would tilt her head, add them up, and announce the missing one. Correct. Always. The audience would swear it was mind-reading.
It wasn't. It was nines. When the math guarantees the answer is a multiple of nine, its digits add up to a multiple of nine too. So Missa just added the digits she was given, then asked: how much more do I need to reach the next multiple of nine? "You read me two, four, and one — that's seven. The next nine is nine. Nine minus seven is two. Your hidden digit is a two." And it would be a two. "The digit isn't gone," Missa always said. "It just left a gap. And a gap tells you exactly what's missing."
Missa knew that feeling — of being the one who left a gap — from the inside.
As a young stagehand, Missa was the easy one to forget. Small, quiet, tucked at the edge of the crew photo, the name skipped on the callsheet. "Wait, were you here?" people would ask, and each time it stung a little more: I'm the one nobody counts. Missa started to believe she was the missing digit in every room — present, but somehow never added in.
Marlow, the stage manager, noticed the empty chair that wasn't empty. Marlow sat beside Missa and, instead of an apology, offered a puzzle. Marlow wrote a big multiple of nine with one digit hidden. "Everyone thinks the missing digit is lost," Marlow said. "It isn't. Watch — I add the others, and the shortfall to nine points straight at it. The missing one is the most findable thing on the page, because everything else is quietly telling you where it is." Marlow looked up. "Nobody is truly missing. Not the digit. Not you. You just have to know what to add up." Something in Missa that had felt uncountable began, quietly, to count.
The kid who came to Missa hung back at the edge, half-expecting to be overlooked.
"You probably won't even notice if I get it wrong," they said, trying to make it a joke.
"I notice everything," Missa said warmly. "That's the whole trick. Here — I'll hide a digit in this multiple of nine, and you find it. Add up the digits you can see."
The kid added: "Three plus one plus two is six."
"How far is six from the next nine?"
"...Three."
"Your hidden digit is a three." The kid checked. Three. Their eyes went wide.
They did it again and again — Missa hiding a digit, the kid summing what remained and reading the shortfall to the next nine. Six to nine is three; eleven to eighteen is seven; every time, the "lost" digit turned up right where the gap pointed. And with each find, the kid seemed to hold themselves a little more like someone who counts — someone worth noticing.
The feeling that welled up in the kid then wasn't only the delight of a clever trick. It was warmer and more personal: the quiet proof that a missing thing is not a lost thing, that a gap is not an absence but an address. If a hidden digit can always be found, then maybe the one who feels overlooked can be found too. That soft, steadying warmth — I am not missing; I can be counted — spread all the way through, and Missa felt the old ache ease, because it was the exact finding Marlow had once given a stagehand who thought she was the digit nobody added in.
"Add what you see, and the gap to nine names the rest," Missa said gently. "Nothing that leaves a gap is really gone. Not a digit. Not you."
Hear it as an audio drama
A short play starring Missa, from ShowMath. Different voices, same idea. Listen any time after you read.
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Read the drama script
- Narrator: From Spark and Anvil and Showmath — this is Missa, in chapter 1 of the Showmath cast.
- Narrator: This drama uses an AI-generated voice. Voiced via Gemini 2.5.
- Narrator: Missa did the trick that made audiences gasp. Cross out any digit of your answer — don't tell me which — then read me the rest, in any order. The volunteer would hide a digit and mumble the others, and Missa would tilt her head, add them up, and name the missing one. Correct. Always. The audience swore it was mind-reading.
- Missa: It isn't. It's nines. When the math guarantees the answer is a multiple of nine, its digits add up to a multiple of nine too. So I just add the digits I'm given, then ask: how much more do I need to reach the next nine? You read me two, four, and one — that's seven. The next nine is nine. Nine minus seven is two. Your hidden digit is a two. The digit isn't gone. It just left a gap — and a gap tells you exactly what's missing.
- Narrator: Missa knew that feeling — of being the one who left a gap — from the inside. As a young stagehand, Missa was the easy one to forget. Small, quiet, tucked at the edge of the crew photo, the name skipped on the callsheet. Wait, were you here? people would ask, and each time it stung: I'm the one nobody counts.
- Marlow: Everyone thinks the missing digit is lost. It isn't. Watch — I add the others, and the shortfall to nine points straight at it. The missing one is the most findable thing on the page, because everything else is quietly telling you where it is. Nobody is truly missing. Not the digit. Not you. You just have to know what to add up.
- Narrator: Something in Missa that had felt uncountable began, quietly, to count. So when a kid hung back at the edge, half-expecting to be overlooked, Missa saw it.
- Kid: You probably won't even notice if I get it wrong.
- Missa: I notice everything — that's the whole trick. I'll hide a digit in this multiple of nine, and you find it. Add up the digits you can see.
- Missa: How far is six from the next nine?
- Kid: Three. The missing digit is three?
- Missa: Three. It was never lost. It left a gap, and the gap pointed right at it — the way you've been pointing at yourself all along. You count. You always did.
- Narrator: You've been listening to a Spark and Anvil chapter, written by the Spark and Anvil writing team for ages 9 to 14.
- Narrator: Apps stay free forever.
- Narrator: Curriculum aligned to Common Core and Next Generation Science Standards.
- Narrator: Released under Creative Commons BY-NC-SA 4.0 for educational reuse. Visit Spark and Anvil for the full transcript.
The ShowMath ensemble
Missa is one of the friends in ShowMath. Each friend shows you one idea by how they act; meet them all and you have the whole subject.
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Wendel
The Calendar-Keeper — anchors the year's doomsday and steps by sevens to name the weekday of any date
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Elvi
The Eleven-Splitter — pries a number's digits apart and drops their sum into the gap (times-eleven shortcut)
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Fiva
The Fives-Finisher — rounds a number ending in 5 to a friendly pair, then tacks on 25 to square it
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Squarl
The Squaring-Bouncer — bounces to the nearest round number and back to square any number in her head
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Dashel
The Left-to-Right Racer — answers biggest-place-first, out loud, before the calculator finishes
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Magda
The Magic-Square Weaver — seeds a four-by-four square from a date so every row, column, and diagonal sums the same
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Nabo
The 1089 Conjurer — reverses, subtracts, reverses, adds, and always lands on 1089
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Halvra
The Double-and-Halver — doubles one factor and halves the other until multiplying is easy
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Modo
The Clock-Winder — wraps numbers around a clock of any size, the engine under the calendar and missing-digit tricks
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Marlow
The Stage Manager — a warm, attentive adult who coaches rehearse-then-perform and reveal-the-secret, and never performs for the kid
