Tables and Line Graphs

Reading Tables #

Find the row, find the column, read the cell.

A table is read by finding the row and the column and taking the cell where they cross

How many books did Ben read on Tuesday? Start at Ben’s row.

Now run along to the Tuesday column. Row and column cross at 6.

Add along a row for a total: Ben read 3 + 6 + 1 = 10 across the three days.

The row total still holds: 10 − 3 − 1 leaves 6 for the missing Tuesday.

Line Graphs #

A dot per reading, joined to show the change.

Each dot on a line graph is one reading, and the slope between dots is the change

One reading per day, joined in order. Read Tuesday: up to its dot, across to 5.

From Tuesday to Wednesday the line falls from 5 to 4 — one degree colder.

The steeper the line, the faster the change. A flat piece means no change.

Line Plots in Halves and Fourths #

Measurements between the whole marks, counted.

A line plot marked in halves and fourths lets fractional measurements be counted and compared

Nine seedlings, each measured to the nearest quarter inch, one dot apiece.

Repeats stack, so the tallest column is the height measured most often.

A scale of halves has only five marks: 1¾, 2¼ and 2¾ land between them.

The gap from shortest to tallest is a subtraction: 2¾ − 1½ = 1¼ inches.

A column adds too: the two seedlings at 1¾ come to 3½ inches together.