The first step would be to read the invisible mathematical problems.
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0.6 x 0.6 = 0.36 I recommend to use a calculator if you want to solve mathematical problems.
Assume something (e.g. equations) using k then prove k+1 using k.
1. Summarize 2. Variable 3. Equation 4. Solve 5. Full sentence answer
To solve problems quickly you must have simple but effective method.
Diligent study for a number of years has given me the tools I need to solve most math problems I encounter.