Measurement & data
Read tables and charts
TEAS math
Read the exact numbers off the table first, then do arithmetic on what you copied.
What this covers
- Find the rows or columns the question names and copy their values down.
- A difference question subtracts the two values; a total question adds them all.
- An average divides the total by how many entries went into it.
- A percent-of-total question needs the whole table's sum as the denominator.
Worked example
Worked example
Visitors — Sat: 152, Sun: 118. How many more came on Saturday?
- 152−118=34How many more means the gap between the two rows, not their sum.
Another worked example
Groups A–D have 8, 12, 6, and 14 observations. Find B's share and D minus C.
- N=8+12+6+14=40Add every group to identify the whole.
- 4012⋅100%=30%,14−6=8A share divides a part by the whole; a difference subtracts the requested counts.
A common mistake
A mistake Lemma catches
From
increase=(15−12)increase=(15−12)⋅1000
“The axis counts thousands, so each unit on it is 1 · 1000 = 1000 visitors. The bars differ by 15 − 12 = 3 units, which is 3 · 1000 = 3000 visitors, not 3.”
Try one
Sample problem
A chart shows visitors by day — Saturday: 152, Sunday: 132. How many more visitors came on Saturday than on Sunday? Enter the number.
Sat: 152,Sun: 132Practice charts free
No account, no email. Every line you type is checked by the same computer algebra system as the worked example above.
Where this fits
Before this