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Secret Code Math

154 worksheets

Code addition worksheets give addition practice a satisfying twist: each sum has an answer, and each answer stands for a letter, so solving the row of sums spells out a hidden word. Children get genuine addition repetition and a reason to keep going — the reveal at the end. It suits children secure enough with sums to enjoy a puzzle, usually kindergarten through grade 2. Each code addition worksheet is a free printable PDF with a matching play-online version: the interactive one checks each sum and fills the code, the printable works for early finishers or homework, and an answer key is included. The full set is available in all 11 languages we publish in.

How to use these worksheets

Print the PDF for a no-prep classroom or homework task, or open the play-online version on a tablet or whiteboard for instant feedback. Every worksheet includes an answer key, so children can self-check or work independently. Mix sheets across themes and grade levels to build a short Code Addition lesson, or send one home for extra practice.

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Frequently asked questions

What does code addition practise?
Single-digit addition plus a letter-code reveal — sums map to letters that spell a word; kindergarten to grade 2.
Are they free to use?
Yes — free to print and to play online, each with an answer key, no signup or paywall.
Which languages are they available in?
All 11 languages we publish in.

Code Addition in other languages

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