540/4=135
540/10=54
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For a number to be divisible by 3, its digit sum has to be divisible by 3. For a number not to be divisible by 2, the last digit must be a 1,3,5,7 or 9. Using these rules, the numbers between 500 and 600 that divide by 3 but not 2 become clear: 501, 507, 513, 519, 525, 531, 537, 543, 549, 555, 561, 567, 573, 579, 585, 591 and 597
500
The halfway point between 500 and 600 is (500 + 600) ÷ 2 = 550
550 is halfway between 500 and 600
There are 22 numbers between 400 and 600 that are divisible by nine.
510,540,570,
The number halfway between them is 600.
For a number to be divisible by 3, its digit sum has to be divisible by 3. For a number not to be divisible by 2, the last digit must be a 1,3,5,7 or 9. Using these rules, the numbers between 500 and 600 that divide by 3 but not 2 become clear: 501, 507, 513, 519, 525, 531, 537, 543, 549, 555, 561, 567, 573, 579, 585, 591 and 597
9
500
603, 606, ... (64 more of them).
The halfway point between 500 and 600 is (500 + 600) ÷ 2 = 550
550 is halfway between 500 and 600
The number is 536.
242 = 576
There are 22 numbers between 400 and 600 that are divisible by nine.
7