453
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Try all pairs of factors that multiply to get 588.
They both must be negative to get 588 and add to get a negative number.
1,588 no
2,294 no
3,196 no
4,147 no
6,98 no
7,84 no
12,49 no
14,42
so forth
so forth
There are not any.
The numbers are 135 and 136.
288. All multiples of 9 will have digits that add to a multiple of 9. To get a multiple of 9 to be all even, you need to get them to add to 18, since no set of even numbers will add up to 9. 288 is the lowest multiple of 9 to be able to add to 18. ■
79
270
The answer is 1152. Simply add the numbers together arithmetically as you would for the problem two plus two. To check your work, a calculator is the best option.