Problem
The highest point is Thursday, two squares above 700: 700 + 2 × 20 = 740 cones.
The tallest dot marks the biggest value on the graph.
3.MD.B.3Draw A DiagramThursday's point on the line graph reads as 740 cones sold.
The reading is the labeled 700 line plus the extra height above it: the dot sits two squares over 700, and those two squares stand for 40 more cones, so 700 + 40 = 740.
The height above the 700 line is 40 cones, because it is two grid squares and each square counts 20 cones.
Each square counts 20 cones, because the 100 between labeled lines is split into five equal squares, and five equal squares of 20 stack up to exactly 100.
Two squares is two equal groups of 20 cones, and two 20s add up to 40.
The full reading is the base 700 joined with the 40 above it, with no gap and no overlap, so the parts add back to 740.
The lowest point is Monday, one square above 500: 500 + 20 = 520 cones.
The lowest dot marks the smallest value.
3.MD.B.3Draw A DiagramThe difference between the busiest and slowest day is 740 - 520 = 220 cones.
Max minus min gives the spread between the best and worst day.
5.MD.B.2Identify SubproblemsHighest dot minus lowest dot - just remember each square here is worth 20!