The document lists keywords used to indicate different math operations in word problems, grouped by operation type: addition, subtraction, multiplication, division, and equality. Keywords for addition problems include gain, more, combined, plus, and total. Subtraction keywords include loss, fewer, decrease, minus, reduce, and take away. Multiplication keywords involve multiplying numbers together or doubling/tripling values. Division keywords relate to splitting quantities into parts or shares. Equal keywords show that two amounts are the same.