42
Tables
Textbook, pp. 197–199
GoalRead and make tables; total and compare the data in a table.
New words
table · jadvalrow · qatorcolumn · ustuntotal · jami
Explanation
A table is one of the most convenient ways to present data. It consists of rows and columns; the data item sits in the cell where they cross. The title tells what the table is about, and the row and column headings tell what each cell means. Often the last row or column says “Total”: it is the sum of the numbers in that row or column. We can check the totals in two ways, by rows and by columns: both results must be the same.
Worked examples
Classes planted trees: 6-A — March 5, April 3; 6-B — March 4, April 4. March total 5 + 4 = 9, April total 3 + 4 = 7, altogether 16.
Reading table: Monday 12, Tuesday 15, Wednesday 9 pages. In three days 12 + 15 + 9 = 36 pages.
Class activity
“Class survey”: pupils survey favourite subjects and record the results in a table (row — subject, column — boy/girl). They compute the totals by rows and by columns and check them.
Practice
1
In a reading table Monday is 12, Tuesday 15 and Wednesday 9 pages. How many pages in the three days?
36
2
Class 6-A planted 5 trees in March and 3 in April; 6-B planted 4 in March and 4 in April. How many trees were planted in all?
16
3
What does the “total” cell in a table mean?
The sum of the numbers in that row or column.
4
Why is it useful to compute the total both by rows and by columns?
If the two results differ there is a mistake, so one method checks the other.