BEDMAS is an acronym that reminds us of the correct order of operations:.
BEDMAS tells us that brackets are the highest priority, then exponents, then both division and multiplication, and finally addition and subtraction. This means that we evaluate exponents before we multiply, divide before we subtract, etc. Following BEDMAS ensures that everyone gets the same answer every time.
Video
Worksheet 1 (first steps)
Worksheet 2 (strengthen)
Worksheet 3 (extend)