Word problems with "more" and "fewer" 2 - Khan Academy Practice solving more word problems by finding how many more (or fewer) objects there are. Numbers used are 20 or less. ... Math: Pre-K - 8th grade; Pre-K through grade 2 (Khan Kids) Early math review; 2nd grade; 3rd grade; 4th grade; 5th grade; 6th grade; 7th grade; 8th grade;