Sturdy paper or a thin magnetic board resists spills and eager little hands. Use erasable markers for weekly notes, but keep the core numbers printed. A photo backup on your phone ensures you still have access when takeout receipts hide the original.
One visible tab, big fonts, frozen header, and locked formulas stop accidental drift. Keep inputs on the left, totals on the right, and a single green indicator for under-budget. If you must scroll, it is no longer truly one page.
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