Amber bought a pair of shoes for $24.75 and a purse for $36.90, and the sales tax on the purchase was $4.32. How much money did she need in total at the till?

1. The total spend is the sum of the two items plus the sales tax. 2. Line up the decimal points and add the items first: 24.75 plus 36.90 equals 61.65. 3. Add the tax: 61.65 plus 4.32 equals 65.97. 4. Amber needed $65.97 in total. 5. Stopping at $61.65 forgets the sales tax, which still has to be paid at the till. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 5 "Decimals", section 5.2 Decimal Operations_