105
The 4 times table
Textbook: Part 3, lesson 99, pp. 58–59
GoalKnow the 4 times table; perimeter and area of a square.
New words
the 4 times table · 4 ga ko‘paytirish jadvalisquare · kvadratperimeter · perimetrarea · yuz
Explanation
The 4 times table: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40. A square has 4 equal sides, so its perimeter is P = a × 4. Its area is S = a × a. A square with side 3 cm has perimeter 3 × 4 = 12 cm and area 3 × 3 = 9 cm².
Worked examples
If 4 issues of a newspaper come out each month, in 9 months there are 4 × 9 = 36 issues.
4 × 6 = 24 and 7 × 4 = 28.
Class activity
“Count in fours”: children step in fours up to 40, saying the product from the table at each step.
Practice
1
4 × 7 = ?
28
2
A square has side 5 cm. What is its perimeter in cm?
20
3
A square has side 4 cm. What is its area in cm²?
16
4
Aziz makes 4 news sheets every month for the class corner. How many sheets does he make in 9 months?
36
5
Find the unknown number: 4 × □ = 28.
7