Practice some commonly underdeveloped math basics
Without strong foundations, simple computation becomes a barrier to understanding new concepts, as too many ‘resources’ are being tied up trying to recall how to do simple operations, or worse, do them wrong.
These are meant to be a quick check and review of foundational skills. For more comprehensive lessons & worksheets, check out:

Handy math review sheets
Fractions
Operations and cancelling out fractions
Roots & Radicals
Rationalization & simplification of roots
Factoring
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