# Is the number 25 odd or even

## Understand math 1, textbook

I1 Numbers and measures Even and odd numbers The natural numbers can be divided into even numbers (0, 2, 4, 6, 8,…) and odd numbers (1, 3, 5, 7, 9,…). Example: The even number 8 can be represented in a row of two gummy bears. This is not possible with the odd number 9: There is a gummy bear left. Exercise Basics Write down all even numbers between a) 3 and 15, b) 37 and 49, c) 144 and 166! How many numbers is that? Write down all the odd numbers between a) 8 and 22, b) 78 and 94, c) 207 and 251! How many numbers is that? Write down all 1) natural, 2) even, 3) odd numbers between 50 and 100! How many numbers is that? Tick ​​which property applies to the numbers 5, 21 and 43! The predecessor and the successor are both odd numbers. The predecessor and the successor are both even numbers. The predecessor is an even number, the successor an odd number. The predecessor is an odd number, the successor an even number. Multiples of a natural number All even numbers with the exception of the number 0 are multiples of 2. The following applies: 1 2 = 2, 2 2 = 4, 3 2 = 6, 4 2 = 8, 5 2 = 10, ... Multiples of 2 are thus: 2, 4, 6, 8, 10, 12, 14, ... Every further natural number with the exception of the number 0 has multiples, for example: Multiples of 3 are: 3, 6, 9, 12, 15, 18, 21, ... Multiples of 14 are: 14, 28, 42, 56, 70, 84, 98,… Exercises Basics Write down all multiples of a) 4, b) 11, c) 15, d) 25, e) 36 that are less than 60! Write down all multiples of a) 7, b) 9, c) 16, d) 23, e) 49 that are less than 100! D 1.10 D 1.11 D 1.12 I 1.13 D 1.14 D 1.15 16 For testing purposes only - property of V rlags öbv