diff --git a/w17-factorization/w17-factorization-lecture.pdf b/w17-factorization/factorization-lecture.pdf
similarity index 100%
rename from w17-factorization/w17-factorization-lecture.pdf
rename to w17-factorization/factorization-lecture.pdf
diff --git a/w17-factorization/factorization-lecture.xopp b/w17-factorization/factorization-lecture.xopp
new file mode 100644
index 0000000..1dadf3b
Binary files /dev/null and b/w17-factorization/factorization-lecture.xopp differ
diff --git a/w17-factorization/factorization-notes.pdf b/w17-factorization/factorization-notes.pdf
new file mode 100644
index 0000000..4a732ce
Binary files /dev/null and b/w17-factorization/factorization-notes.pdf differ
diff --git a/w17-factorization/w17-factorization-notes.xopp b/w17-factorization/factorization-notes.xopp
similarity index 75%
rename from w17-factorization/w17-factorization-notes.xopp
rename to w17-factorization/factorization-notes.xopp
index 29175b2..b1468d0 100644
Binary files a/w17-factorization/w17-factorization-notes.xopp and b/w17-factorization/factorization-notes.xopp differ
diff --git a/w17-factorization/factorization-solutions.pdf b/w17-factorization/factorization-solutions.pdf
new file mode 100644
index 0000000..29e9bab
Binary files /dev/null and b/w17-factorization/factorization-solutions.pdf differ
diff --git a/w17-factorization/w17-factorization-lecture.xopp b/w17-factorization/w17-factorization-lecture.xopp
deleted file mode 100644
index 79508c2..0000000
Binary files a/w17-factorization/w17-factorization-lecture.xopp and /dev/null differ
diff --git a/w17-factorization/w17-factorization-notes.pdf b/w17-factorization/w17-factorization-notes.pdf
deleted file mode 100644
index 8840f5d..0000000
Binary files a/w17-factorization/w17-factorization-notes.pdf and /dev/null differ
diff --git a/w17-factorization/w17-factorization-solutions.pdf b/w17-factorization/w17-factorization-solutions.pdf
deleted file mode 100644
index 9d468e0..0000000
Binary files a/w17-factorization/w17-factorization-solutions.pdf and /dev/null differ
diff --git a/w18-angles/angles-notes.pdf b/w18-angles/angles-notes.pdf
new file mode 100644
index 0000000..801f4dc
Binary files /dev/null and b/w18-angles/angles-notes.pdf differ
diff --git a/w18-angles/angles-notes.xopp b/w18-angles/angles-notes.xopp
new file mode 100644
index 0000000..d01703b
Binary files /dev/null and b/w18-angles/angles-notes.xopp differ
diff --git a/w18-angles/w18-angles-lecture.pdf b/w18-angles/w18-angles-lecture.pdf
new file mode 100644
index 0000000..5d42f5d
Binary files /dev/null and b/w18-angles/w18-angles-lecture.pdf differ