Using inverse operations means practising the idea at the table with counters or paper models and one clear check. We will demo once, then your child tries.

Materials: Two colours of counters; Paper for ratio or percent notation. 1. Say the goal of Using inverse operations in plain words once. 2. Adult shows 2 red : 3 blue and says the ratio (or 40% of 10). 3. Child builds three ratios or percentage amounts and records each notation. 4. Fresh check: one fresh ratio or percent reading. Record and stop. Done: three correct ratio/percent records. Proof: parent note of examples and results. Stop: End after the fresh check; keep optional challenge for another day.