102
Even and odd numbers
Textbook: Part 3, lesson 96, pp. 52–53
GoalTell even and odd numbers apart.
New words
even number · juft sonodd number · toq sondivisible by 2 · 2 ga bo‘linadidigit · raqam
Explanation
Even numbers are divisible by 2: 2, 4, 6, 8, 10, ... Odd numbers are not divisible by 2 and cannot be split into two equal parts: 1, 3, 5, 7, 9, ... We tell by the last digit: ending in 0, 2, 4, 6, 8 means even; ending in 1, 3, 5, 7, 9 means odd.
Worked examples
24 is even (24 : 2 = 12), 37 is odd.
When children count off and the odd numbers step forward, the even numbers (2, 4, 6, 8) stay in place.
Class activity
“Count off”: children count from 1 to 10. Those with odd numbers step forward, those with even numbers stay. Then they swap.
Practice
1
Write the even numbers among these: 11, 19, 20, 4, 8, 15, 16.
20, 4, 8, 16
2
Which of the numbers 38 and 41 is even?
38
3
Munisa has 24 clothes pegs and uses 2 pegs for each item. How many items can she hang?
12
4
A 12 m rope was cut into 2 equal parts. How many metres is each part?
6
5
14 laces were laid in pairs. How many pairs were made?
7