15
Divisibility rule for 2
Textbook: Part 1, lesson 15, pp. 46–48
GoalKnow the divisibility rule for 2; even and odd numbers.
New words
even number · juft sonodd number · toq soneven digit · juft raqamis divisible by 2 · 2 ga bo‘linadi
Explanation
Divisibility rule for 2: a number that ends in an even digit (0, 2, 4, 6, 8) is divisible by 2 and is called even. A number ending in an odd digit (1, 3, 5, 7, 9) is odd and is not divisible by 2. A number divisible by both 2 and 5 ends in 0, so it is divisible by 10.
Worked examples
48 002 ends in the even digit 2, so it is divisible by 2: 48 002 : 2 = 24 001.
7 785 ends in the odd digit 5: it is not divisible by 2, but it is divisible by 5.
Class activity
“Even–odd”: the teacher says a number; children clap if it is even and raise a hand if it is odd.
Practice
1
From 5 214, 7 785, 9 060, 1 357, 48 002, 66 661 write those divisible by 2.
5 214, 9 060, 48 002
2
How many of the two-digit numbers made from the digits 1, 2, 3 (no repeats) are divisible by 2?
2
3
From 130, 265, 380, 4 506, 9 000 write those divisible by both 2 and 5.
130, 380, 9 000
4
856 sweets can be shared equally between two groups. How many does each group get?
428