Math story · Working dogs
Trough Litres Estimate

The trough looked half full. Half of what? asked Spike. Half of empty is still a guess.
The trough holds about twenty litres when full, he remembered from a marked line.
Half would be about ten. Suzy peered at the water line. It sat a little under half.
Estimate: eight or nine litres, she said. Not a magic number — a careful almost.
They used a ten-litre bucket once to check on a cool morning. The mark matched the story.
Today Spike planned a top-up of about five litres — half a bucket — then check again.
Paris drank politely. Moscow claimed depth like a philosopher. The litres did not argue.
Little Thunder licked the rim and contributed zero useful maths.
Estimate means your best honest guess before you measure. Then you measure.
Working dogs practise both: think the number, test the number, care for thirst.
Tools remind Spike to plan. Buckets and marks do the proving.
Estimate. Then measure true.