Nested loops in code
Write, run, read and alter code (block-based or text-based) that places one loop inside another (for example a loop that draws a square, repeated with a turn after each square to make a rotating pattern), predict how many times the inner steps run altogether (outer repeats × inner repeats), and describe how changing the inner or the outer loop changes the outcome
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Nested loops in code means practising the idea at the table with a simple screen-free or sandbox check. We will demo once, then your child tries.
Materials: Paper command cards (forward, turn, repeat) OR a free visual-blocks editor preview; Pencil. 1. Say the goal of Nested loops in code in plain words once. 2. Adult lines up three command cards into a short sequence that reaches a goal. 3. Child builds three short sequences (or edits one) and tests whether the goal is met. 4. Fresh check: one fresh sequence that reaches the goal. Record and stop. Done: three tested sequences with pass/fail noted. Proof: parent note of examples and results. Stop: End after the fresh check; keep optional challenge for another day.
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Hour of Code
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Hour of Code supports Nested loops in code. An adult previews and guides; this is a learning page, not a scored quiz.
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Before you openAsk the learner one fact they learned and one question they still have.
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Public Code.org page. An anonymous GET on 2026-11-12 returned HTTP 200 with no login or payment prompt for this URL. Opening the link does not save practice or assess mastery. An adult should preview and guide the learner.
Code.org. “Hour of Code.” External page; Gakuva does not copy, host, embed, or redistribute materials.
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Check understanding
- Write and run code with a loop inside a loop (e.g. repeat a 'draw a square' loop 6 times with a turn after each square) and check that the result matches the plan
- Read a program with nested loops and predict how many times the inner action happens altogether (e.g. repeat 3 [repeat 4 [clap]] claps 12 times), then run it to check
- Change either the inner or the outer repeat count in nested-loop code, then explain and test how the change affects what happens
“When your child codes — with blocks in an app like Scratch or with typed code — can they put one 'repeat' loop inside another, for example to draw a ring of squares, and say how many times the inside part will run before they run it?”
Curriculum record
- Type
- Procedural
- Subject
- Computing
- Domain
- Algorithms & Programming
- Age range
- Ages 9–13
Standards