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brisamauro27
27.05.2020 •
Mathematics
A rose bush is 18.32 cm tall. It will grow to 28.9 cm tall. How much taller will the rose bush grow?
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Ответ:
Have a great day! :)
Ответ:
Start with the smallest 3-digits number 100. Then 9 consecutive natural 3-digits numbers are:
100, 101, 102, 103, 104, 105, 106, 107, 108.
Rule: A number is divisible by 9 if the sum of its digits is divisible by 9.
The remainders after division by 9 are:
8, 7, 6, 5, 4, 3, 2, 1, 0 (number 108 have the sum of digits 1+0+8=9 that is divisible by 9 without remainder. Each previous number gives the remainder that is 1 more than the next one).
Rule: A number is divisible by 3 if the sum of its digits is divisible by 3.
The remainders after division by 3 are:
2, 1, 0, 2, 1, 0, 2, 1, 0 (numbers 102, 105, 108 have the sums of digits 3, 6, 9 that are divisible by 3).