Learn Divisibility by 2 and Even-Odd Number Rules

1) Which of these numbers is divisible by 2?

13

25

18

37

Numbers divisible by 2 are even. 18 is even; the others are odd.

Explanation

Numbers divisible by 2 are even. 18 is even; the others are odd.

2) A number is divisible by 2 if the ones digit is:

Odd number

5

7

Even number

If the last digit is even (0,2,4,6,8), the number is divisible by 2.

Explanation

If the last digit is even (0,2,4,6,8), the number is divisible by 2.

3) Which number is even?

21

44

57

99

44 ends in 4 (even). The others end in odd digits.

Explanation

44 ends in 4 (even). The others end in odd digits.

4) Which of the following is not divisible by 2?

64

28

31

100

31 ends in 1, which is odd. All the others end in even digits.

Explanation

31 ends in 1, which is odd. All the others end in even digits.

5) A number is divisible by 2 if it ends with:

1, 3, 5, 7, 9

0, 2, 4, 6, 8

5 or 0

Any number

These digits show even numbers, so the number divides by 2.

Explanation

These digits show even numbers, so the number divides by 2.

6) Which number is odd?

20

36

48

51

51 ends in 1, an odd digit.

Explanation

51 ends in 1, an odd digit.

7) Which of these numbers is divisible by 2?

72

35

49

101

72 ends in 2, an even digit.

Explanation

72 ends in 2, an even digit.

8) Which number is even?

17

33

86

95

86 ends in 6, an even digit.

Explanation

86 ends in 6, an even digit.

9) Which number below is not divisible by 2?

60

72

84

93

93 ends in 3 (odd).

Explanation

93 ends in 3 (odd).

10) Which of these numbers ends in an even digit?

37

59

61

82

82 ends in 2, which is even.

Explanation

82 ends in 2, which is even.

11) Which of these is an even number?

73

85

97

100

100 ends in 0, which is even.

Explanation

100 ends in 0, which is even.

12) Which number is divisible by 2?

55

77

88

99

88 ends in 8, an even digit.

Explanation

88 ends in 8, an even digit.

13) Which of these numbers is odd?

46

59

80

92

59 ends in 9 (odd).

Explanation

59 ends in 9 (odd).

14) Which number is divisible by 2?

141

246

357

999

246 ends in 6, which is even.

Explanation

246 ends in 6, which is even.

15) Which of these numbers is even?

25

37

104

119

104 ends in 4, which is even.

Explanation

104 ends in 4, which is even.

16) Which number is divisible by 2?

200

203

205

207

200 ends in 0, so divisible by 2.

Explanation

200 ends in 0, so divisible by 2.

17) Which of these numbers is odd?

314

426

520

639

639 ends in 9, which is odd.

Explanation

639 ends in 9, which is odd.

18) Which is the smallest even prime number?

0

1

2

3

2 is the only even prime. All other even numbers are composite.

Explanation

2 is the only even prime. All other even numbers are composite.

19) Which of these is the divisibility rule for 2?

Ends in 5 or 0

Add digits → divisible by 3

Last digit is even

Double the last digit and subtract

That’s the exact rule.

Explanation

That’s the exact rule.

20) Which number is not divisible by 2?

14

22

111

140

111 ends in 1 (odd).

Explanation

111 ends in 1 (odd).