Do your Year 6 students need a low-prep, self-checking activity that actually keeps them focused — and makes them want to check their work?

This secret message task card activity targets multiplying whole numbers and decimals by powers of 10, aligned to AC9M6N06 of the Australian Curriculum V9.0. Students solve 16 task cards, and each correct answer reveals a letter that gradually uncovers the punchline to a maths-themed riddle. Get an answer wrong and the message doesn't make sense — so students are naturally motivated to go back and fix their errors rather than guessing and moving on.

Print-and-go, low-prep, and ready to use in any setting.

✓ 16 secret message task cards — full-colour and black and white low-ink versions included (print-and-cut)

✓ Student recording sheet — students log answers and build the secret message as they work

✓ Answer key — card number, correct answer, and corresponding secret message letter

✓ Teacher notes — includes learning objectives and teacher tips

Questions cover:

• Multiplying whole numbers by 10, 100, and 1,000
• Multiplying decimals by powers of 10
• Recognising place value patterns as numbers become larger
• Moving digits correctly when multiplying by powers of 10
• Checking answers for reasonableness using place value knowledge

The variety of question types means students build fluency across the full scope of AC9M6N06 — not just one narrow skill — making this a strong end-of-unit consolidation task as well as a mid-unit check-in.

Works perfectly for:

• Maths centres and rotations
• Independent practice and early finishers
• Partner and small group work
• Whole-class review
• Informal formative assessment

Australian Curriculum V9.0 alignment: Primary: AC9M6N06 — Multiply and divide decimals by multiples of powers of 10 without a calculator, applying knowledge of place value and proficiency with multiplication facts

Low prep. Self-checking. Surprisingly fun.