120
The multiplication table
Textbook: Part 3, lesson 113, pp. 88–89
GoalThe multiplication table: find products by row, column and address; use the table for division.
New words
table · jadvalrow · satrcolumn · ustunaddress · manzil
Explanation
We write all the times tables in one table. To find a product we look where a row and a column cross: row 6 and column 8 give 48. The table is a mirror: a × b = b × a. For division: 48 : 6 – find 48 in row 6 and read the column number: 8. On the diagonal stand 1, 4, 9, 16, ... 100.
Worked examples
Row 6, column 8 is 48. So 6 × 8 = 48 and 48 : 6 = 8.
The diagonal numbers are 1 × 1, 2 × 2, 3 × 3, ... 10 × 10.
Class activity
“Address in the table”: children draw a big table. One says an address (row 4, column 7), another finds the product; then they swap roles.
Practice
1
7 × 9 = ?
63
2
70 : 7 = ?
10
3
A block of flats has 6 entrances with 8 flats in each. How many flats are there?
48
4
Hamid received 6 notes of 5 thousand so‘m. How many thousand so‘m did he get?
30
5
In a new district 83 five-storey houses were built and 18 fewer nine-storey houses. How many houses were built in total?
148
6
A rectangle has sides 7 cm and 5 cm. What is its area in cm²?
35