Adding Within 1,000 Fluently

Last year you added with blocks. The method has not changed, only the speed.

Still like units

Hundreds with hundreds, tens with tens, ones with ones.

Estimate first

Round both numbers before you start. Now you know what to expect.

What fluency actually means

Fluent does not mean fast at any cost. It means accurate, reasonably quick, and flexible enough to choose a sensible method. Someone who gets every answer right in ten seconds using a good strategy is more fluent than someone who guesses in two.

Some sums do not need the column method

298 + 145 is easier as 300 + 145 = 445, then take back the 2: 443. Adjusting to a friendly number and compensating afterwards is often faster than writing anything down. Look at the numbers before deciding to set them out in columns.

Check every time

Estimate first to know the ballpark, calculate, then compare. With three-digit numbers, a misplaced digit changes the answer by ninety or nine hundred, which an estimate catches instantly. Building this into the routine costs a few seconds per sum.