A washing machine's regular price is $588, and its sale price is $399. What is the difference between the two prices?

1. Subtract the sale price from the regular price: 588 - 399. 2. Subtract the ones: 8 - 9 cannot be done directly, so borrow 1 ten, making it 18 - 9 = 9. 3. Subtract the tens: with 1 ten borrowed, 7 - 9 cannot be done directly, so borrow 1 hundred, making it 17 - 9 = 8. 4. Subtract the hundreds: with 1 hundred borrowed, 4 - 3 = 1. 5. Reading the digits gives 189, so 588 - 399 = 189. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 1 "Whole Numbers", section 1.3 Subtract Whole Numbers_