Number recognition development with number card: Single subject research

<span lang="EN-US">Mentally retarded is a mental disorder with an intelligence quotient (IQ) between 55-70, besides those mentally children are only able to think concretely. For this reason, learning mathematics for students requires media that can bridge abstract mathematical material the abilities of who The objective study was improve recognition 1-20 numbers using number cards mild retardation. research used single subject method basic design non reversal. Study subjects were selected based on purposive sampling technique, as researcher had look Data collection techniques use documentation find out retardation characteristics, and tests determine subject's ability recognize 1-20. results indicate card This be seen from average in baseline phase 39 percentage 33.3%, intervention 74.44 88.89%.</span>