Subtract 18 from 100: Column Method Step-by-Step

$$$\begin{aligned} &100 \\ -& \\ &~~18 \\ &\underline{\phantom{776}} & \\ \end{aligned}$

To solve the problem $100 - 18$, we'll perform the subtraction using borrowing:

• Step 1: Arrange the numbers vertically:
  $\begin{aligned} & 100 \\ - & \\ & ~~18 \\ & \underline{\phantom{776}} \end{aligned}$
• Step 2: Start subtracting from the rightmost digit (the units place). Subtract 8 from 0. Since 0 is smaller than 8, we need to borrow.
• Step 3: Borrow from the tens place. The tens place is also 0, so we must continue to the hundreds place. Borrow 1 from the hundreds place, turning it from 1 to 0, and making the tens place 10.
• Step 4: Now we have 10 in the tens place. Borrow 1 from this new tens digit, turning it from 10 to 9, and giving the units place 10.
• Step 5: Subtract 8 from 10 in the units place. This gives us 2.
• Step 6: Move to the tens place. Subtract 1 from 9, which gives us 8.
• Step 7: As there's nothing left to subtract in the hundreds place, we are left with 0.
• Step 8: Combine the results to form the final answer: 82.

Therefore, the solution to the subtraction problem is $82$.