Add:
10
+80


Answer:

90

Step by Step Explanation:
  1. As, we see that 10 and 80 are the multiples of 10, the ones digit of the addend will remain 0 and we will add the tens digits of the numbers to obtain the tens digit of the addend.
  2. The digit at the tens place of 10 is 1 and the digit at the tens place of 80 is 8.
    Adding, 1 + 8 = 9
  3. Placing 9 at the tens digit and 0 at the ones digit to obtain the addend, we have:
    TO
    90
  4. Hence,
    TO
    10
    +80
    90

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