The 9 times table
1*9 = 9
2*9 = 18
3*9 = 27
4*9 = 36
5*9 = 45
6*9 = 54
7*9 = 63
8*9 = 72
9*9 = 81
10*9 = 90
11*9 = 99
12*9 = 108
All the ones in bold are two digit numbers divisible by 9 because they are multiples of 9. THAT IS WHY YOU SHOULD LEARN YOUR TIMES TABLES!
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987
All whole numbers are divisible by 1. Numbers are divisible by 2 if they end in 2, 4, 6, 8 or 0. Numbers are divisible by 3 if the sum of their digits is divisible by 3. Numbers are divisible by 4 if the last two digits of the number are divisible by 4. Numbers are divisible by 5 if the last digit of the number is either 5 or 0. Numbers are divisible by 6 if they are divisible by 2 and 3. Numbers are divisible by 9 if the sum of their digits is equal to 9 or a multiple of 9. Numbers are divisible by 10 if the last digit of the number is 0.
All 4 digit numbers that are divisible by 9 are also divisible by 3. The first is 1008 and the last is 9999.
There are five numbers: 18, 36, 54, 72, 90.
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