Good resource but "the steps to front-end estimation with decimals" may benefit from some revising. If I were to rewrite them, I would do so as follows: 1) Add OR SUBTRACT the front digits of the numbers being added or subtracted.; 2) Round off the decimals of the numbers being added or subtracted; *ADD THIS STEP: 3) Add or subtract the rounded decimals.; 4) Combine the results OF STEPS 1 AND 3.
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