1. Mental math and paper-and-pencil methods can be faster than technology, if you have an efficient strategy.
2. Use of technology (and paper) may not be available or appropriate.
3. Mental math and paper-and-pencil methods help understanding of the material and learning new concepts.
4. Mental math leads to fluency and confidence.
5.Use mental math to check or estimate an answer obtained from a calculator (or other technology) or from a paper and pencil calculation.
6. It will be on the test.