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MathematicsAddition & SubtractionAges 7–10

Missing number problems (age 7+)

Solve addition and subtraction problems including missing-number problems, using number facts, place value, and more complex methods

Lesson

Set out your lesson

Identify missing quantities, choose a suitable method, and check equations and two-step problems.

Use the readiness card before Show. Record the actual response and any help. Pause for prerequisite teaching when needed.

Before teaching

Use this short check, then start teaching.

Givens

R1. Complete 40 + □ = 65. R2. Complete □ − 10 = 20. R3. Write 245 as hundreds, tens, and ones.

R1. Missing number:

R2. Missing number:

R3. Hundreds:

R3. Tens:

R3. Ones:

Printer, credit, and teaching notes
Credit

Original Gakuva arithmetic teaching and paper charts. Canonical target: Marble Skill Taxonomy v1, Generative Spark, Inc., commit 96a7933754af672e1bfdbf7ecb05c325860c6e0d. Database: ODbL-1.0. Content: CC-BY-SA-4.0.

No Printer

Read the active card on screen. Copy its empty chart and response headings onto plain paper. An adult may read the question. Record adult reading, hints, and transcription separately.

Check the actual response before Show. Record help rather than assuming readiness.

Use paper and a pencil. Work on one numbered problem at a time. Split the set across sessions if needed. Keep adult keys separate.

Use the complete materials on screen or print only the current sheet. Keep adult guidance out of learner view.

How this lesson works

Complete place-value tables show exchanges and alignment. Blank tables and response fields support paper work. No digital game is needed.

Next: Show

Adult extras
Teaching limits and safe use

These are finite task opportunities, not proof of mastery. Record what was attempted and what support was used.

  • A correct scalar answer alone does not show written placement or working.

  • These are finite task samples. They do not establish fluency or mastery.

  • Record prior exposure, adult reading, hints, and transcription separately.

Record the actual response and support. These activities do not establish mastery.

Share teaching feedback

Continue learning
Share and support
Family records and proof options

Keep a record of your learning

Save photos, notes, and attendance. Export a proof packet for compliance or portfolio reviews.

View learner plans ($12/mo per learner) See sample family archive

Learning resources

Extra practice links — they do not replace Gakuva’s teaching approach.

Toy Theater · Practice link — not the full lesson

Missing Addend — foundational single-digit warm-up

Open practice (new tab)
Before you open · source notes

Find the missing number in a single-digit addition equation and check the feedback.

Single-digit warm-up only, not three-digit or multi-step practice · Ads; parent supervision recommended · No login/payment in recorded test; access can change.

Before you open

Audio, a complete playthrough and physical-device/mobile usability were not verified. Use separate instruction for the harder missing-number target.

Opening this link does not save learning or assess mastery.

Parent tips

Ask which number makes the equation true, then use subtraction to check. Ask the learner to explain how they know. This discussion is parent-led.

Source, access and review notes

Choose the missing number in a single-digit addition equation and check the game's feedback. Use this as a warm-up before harder missing-number problems.

Foundational supplementary practice only; not coverage of the three-digit/multi-step Missing number problems target. Parent prompt: “What number makes this equation true? Can you use subtraction to check it? Tell me how you know.”

Tested interaction required no login or payment. Advertisement labels observed. Audio, complete playthrough, and physical-device/mobile usability were not verified. Parent supervision recommended around ads. Access and advertisements can change.

Unknown — link only

Check understanding

  • Solve a missing-number problem such as 245 + ? = 380
  • Choose an appropriate method (mental, written, or combination) based on the numbers
  • Solve multi-step problems combining addition and subtraction of three-digit numbers
“Can your child work out sums with a hidden number — like '? − 38 = 24' or '53 + ? = 91' — by thinking carefully about what the equation is asking?”

Curriculum record

Type
Procedural
Subject
Mathematics
Domain
Addition & Subtraction
Age range
Ages 7–10

Standards

acara-v9:AC9M3A01acara-v9:AC9M4A01uk-nc-2013:Ma/KS2/Y3/AS/4