1 min read
What you need
- A plastic tub
- Small waterproof toys
- A washing-up bowl or deep tray
- Warm water in a squeezy bottle
- A spoon and a paintbrush
- Salt
This needs planning the night before, which is the only thing standing between you and one of the longest-running activities on this list.
How to set it up
- The night before, half-fill a plastic tub with water and drop in small waterproof toys — dinosaurs, cars, plastic animals.
- Freeze overnight. For layers, freeze in two stages so toys sit at different depths.
- Turn the block out into a washing-up bowl or tray.
- Give the child warm water in a squeezy bottle, a spoon, a paintbrush and a small amount of salt.
Why it works
There is a clear goal, visible progress, and three different methods that each work at different speeds. Children notice quickly that salt makes holes, warm water makes channels and hitting it does very little — which is a real experiment they are running themselves.
Practical notes
Do it in a tray, outdoors or on a towel; the melt water goes everywhere. Use warm rather than hot water. Skip the salt with children who still put things in their mouths, and keep it away from anything that stains.
Extending it
Ask which method they think will be fastest before they start, then check afterwards. That single question turns it into a proper prediction-and-test.