Lesson 1Understanding the inputRecognize what should be replaced and what stays.Start2 Micro-lessonsMicro lesson 1Spot the variableMicro lesson 2Know what stays fixed
Lesson 2Doing the substitutionReplace variables correctly and avoid common mistakes.Start2 Micro-lessonsMicro lesson 1Replace carefullyMicro lesson 2Handle signs correctly
Lesson 3Evaluating the resultCalculate the final value after substitution.Start2 Micro-lessonsMicro lesson 1Calculate step by stepMicro lesson 2Check the result