place value lab · placevaluelab_m1
Placevaluelab: Build a Number
Bundling regroups the tokens. Shifting scales the amount. Figure out which move changes what — then try to make a zero appear.
Invariant witness: the amount bar judges every regroup and shift; trap missions surface MISC-PV tags.
PredictTestExplainReviseDefendTransfer0/4 evidence steps
hundred-thousands0
ten-thousands0
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The data prints here after you commit.
nothing prints before a committed call
move log
No moves yet — drop tokens, fill a column past nine, then bundle.