What is 207 minus 64?

1. Line up 207 and 64 by place value. 2. Subtract the ones: 7 - 4 = 3. 3. Subtract the tens: 0 - 6 cannot be done directly, so borrow from the hundreds place, turning 2 hundreds and 0 tens into 1 hundred and 10 tens. 4. Now subtract the tens: 10 - 6 = 4. 5. Subtract the hundreds: 1 - 0 = 1, since 64 has no hundreds digit. 6. Reading the digits gives 143, so 207 - 64 = 143. 7. 153 comes from forgetting to reduce the hundreds digit after borrowing, and 241 comes from adding 207 and 64 instead of subtracting. _Source: OpenStax Prealgebra (CC BY 4.0), Ch 1 "Whole Numbers", section 1.3 Subtract Whole Numbers_