comments:
davedirac posted on r/calculators5d
For a six year old large graphing calculators are definitely not a sensible choice, even if for home use only. Sticking to a four function calculator for now is best IMO. But a printing calculator might fascinate him. They usually have additional buttons for tax calculations, so might also be useful to you. Standard size Paper rolls are easily availble EG: https://www.amazon.com/Casio-HR-8TM-Plus-Handheld-Calculator/dp/B000JEA5N4/ref=sr_1_8?