I can add but when it comes to things like when I want to cash my check or write checks, I've got to be able to subtract, etc. Several stakeholders echoed the same sentiment about relevance and connections. Whatever skills are needed, there needs to be relevance to life and application across activities. One of our hiring practices is to run through a simulated production. You need to develop interesting programs, have a cash register in the classroom, do medical calculations, simulate real life in the classroom.
Textbooks get boring.
Come visit our plant. To this end mathematics needs to be taught using REAL problems, not textbook reality. Carrying this teacher suggestion one step further, teachers need to become more knowledgeable about the world of work in order to offer relevant math curricula. Use learner-centered approaches to teaching to ensure that learners see the relevance of what they are learning. Math learning for adults should be relevant to their own personal goals, whether it be to attain a GED certificate, a job, or whatever.