How do solve 76 plus 102774657465748399292003764563782846645455 plus 12345678910123456789101234567891012345678910?

Answer 1

Write the numbers under each other with the place value columns aligned - this is easiest done by aligning the decimal points which are "hiding" after the last digit of the whole numbers.

Now add like normal, starting with the rightmost column add the digits in that column carrying excess tens to the next column to the left to be added in, writing the rest of the number under each column of its sum.

Doing this you should find:

76 + 102774657465748399292003764563782846645455 + 12345678910123456789101234567891012345678910 = 12448453567589205188393238332454795192324441

Answer 2

You write the numbers, one below the other, with their right ends lined up. Then starting from the right most column of digits, you sum each column, carrying across any "tens" at each stage to the column on the left.